A&P 2

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nora_phllps
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133590
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A&P 2
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2012-02-11 13:30:06
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Cardiovascular system
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Cardiovascular system
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  1. What type of mixture is blood?
    Homogeneous, contains both cellular and liquid components, formed elements and plasma.
  2. What is the average normal PH range of blood?
    7.35-7.45
  3. What is the vicosity of a fluid?
    Resistance of a fluid to flow due to cohesion and between its particles.
  4. What would be a normal hematocrit value range for males/females?
    Males-47, females 42
  5. What unit is used to measure hematocrit?
    percentage
  6. Define hematocrit?
    Seperation of formed elements.
  7. 3 major functions of blood?
    • Distribution-delivers oxygen from lungs & nutrients from digestive tract to all body cells.
    • Regulation-blood clotting to stop bleeding, body temp by absorbing& distrubting heat to body and skin.
    • Protection-prevents infection by producing antibodies, WBC's and complements proteins.
  8. What are formed elements of blood?
    • Erythrocytes-92-94%
    • Leukocytes
    • platelets
  9. Erythrocytes can transport both oxygen and ____________?
    Carbon dioxide
  10. What is the normal measurable range for hemoglobin in a healthy individual?
    • infants 14-20gm
    • males 13-18gm
    • females-12-16gm
  11. What unit is used to measure hemoglobin
    gms
  12. What organ in the body regulates erythrocyte production?
    Kidney
  13. What condition and organ triggers erythropoiesis?
    Hypoxia or low o2 levels in blood. Kidneys produce erythropoietin which stimulates erythropoiesis.
  14. _______marrow is the main site of blood cell formation throughout adult life?
    Red bone marrow
  15. _____is the parent cell for all formed elements of blood?
    Hemocytoblast
  16. List the cells in developmental sequence of erythrocytes from hemocytoblast to maturity.
    • Proerythroblast
    • early erythroblast
    • late erythroblast
    • normoblast
    • reticulocyte
    • erythrocyte
  17. What is the major cause for red blood cells to age and wear out?
    Lack of cellular organelles, lack of nucleus, unable to sythesize new proteins
  18. The __ and __ are involved in breaking up old erythrocytes and disposing of the cellular remains?
    Liver and spleen
  19. __is a bile pigment formed by the breakdown of hemoglobin from expired erythrocytes?
    bilirubin
  20. What characteristics do all leukocytes have in common?
    irregular shaped nucleus
  21. What is leukopoiesis?
    process of making leukocytes, production of white blood cells
  22. % of each leukocyte in normal circulating blood?
    • neutrophils 50-70%
    • lymphocytes 25%
    • monocytes 3-8%
    • eosinophils 2-4%
    • Basophils 0.5-1%
  23. Which leukocytes have no visible cytoplasmic granules?
    agranulocytes
  24. The enzyme__ that converts fibrogen to fibrin?
    Thrombin
  25. What is the largest blood developmental cell?
    Megakaryocyte
  26. What are the functions & properties of platelets?
    • cytoplasmic fragments of large cells called megakaryocytes.
    • exhibit a blue staining outer region and granular inside staining purple
    • adhere to damage blood vessels and release enzyme that forms plug, the stoppage of bleeding
  27. What are the 3 events of hemostatis in order?
    • 1-Vascular spasm-responds to injury by constricting
    • 2-platelet plug formation-aggregating (sticking together) forming a plug
    • 3-coagulation-reinforces the plaelet plug with fibrin threads that act as a molecular glue for the aggregated platelets.
  28. When platelets degranulate they release a vasoconstrictor called___ which aids in hemostasis?
    Serotonin
  29. What ion is essential to virtually all stages of coagulation?
    Calcium ions
  30. ___is the pivotal molecule associated with the negatively charged membranes of aggregated platelets?
    PF3
  31. The slowest step in the clotting process is?
    Factor X
  32. How is a clot that is no longer needed removed?
    Fribinolysis
  33. list naturally occuring chemicals that prevent or oppose coagulation
    heparin, nitric oxide, prostacyclin, vitamin e and quinine
  34. Transfusion of incompatable blood can be?
    fatal
  35. are blood typing for the Kell, Lewis and Duffy factors done before a blood transfusion?
  36. What occurs in tissure during a transfusion reaction?
    oxygen carrying capability of the transfused blood cells is disrupted. clumping of RBC's in small vessels hinders blood flow to tissures beyond that point.
  37. List each blood type
    • AB has AB antigen, no antibodies
    • B has B antigen, antibodies A
    • A has A antigen, antibodies B
    • O has no antigens, both antibodies
  38. __is the most common blood type occuring in people of the us.
    O positive
  39. __is the least common blood type occuring in the people of us?
    AB negative
  40. Universal donor?
    O negative
  41. Universal receiver?
    AB negative
  42. __ is a regulatory function of Blood?
    maintence of normal PH in body tissure
  43. ___is not found in blood?
    Glycogen
  44. ___is found in blood?
    Fibrinogen, glucose, urea,albumin
  45. ___is not a formed element of blood?
    antibodies
  46. Parent cell for all formed elements of blood?
    Hematopoietic stem cell
  47. lack of intrinsic factor, leading to a deficiency of vitamin B12 & large pale cells called macrocytes is a characteristic of?
    Pernicious anemia
  48. all can be expected with polycythemia?
    high hematocrit, increased blood volume, high blood pressure
  49. Thromboembolic disorder___
    include embolus formation, a clot moving within the circulatory system
  50. not a cause of bleeding disorders
    excess secretion of platelet-derived growth factor.
  51. bleeding disorder causes?
    thrombocytopenia, a deficit in the clotting factor, vitamin K deficiency
  52. the heart chambers are lined by the ____?
    endocaridum
  53. The __is the layer of the heart that actually contracts?
    myocardium
  54. The right atrium receives blood from the __,__,&__?
    Systemic circuit, superior and inferior vena cava, and coronary sinus.
  55. The left atrium receives blood from the ___?
    lungs through 4 pulmonary veins
  56. Which vessels of the heart received blood during left ventricular systole?
    aorta
  57. which vessel of the heart receives blood during rt ventricular systole?
    pulmonary trunk
  58. How does one easily discern the right and left ventricles when viewing a disected heart?
    the left ventricle is larger and walls are thicker.
  59. The coronary arteries arise from ___ and supply the __ for nutrients and gas exchange?
    • 1)from the base of the aorta,
    • 2) posterior and anterior walls of the ventricles and interventricular septum
  60. What is the function of arterial anastomoses in the coronary circulation?
    provide additional (collateral) routes for blood delivery to the heart muscle.
  61. Small muscle masses attached to the chordae tendineae are the __?
    papillary muscles.
  62. The __valve seperates the right atrium from the right ventricle?
    Tricuspid valve
  63. The __ valve seperates the left atrium from the left ventricle?
    Bicuspid valve
  64. Aortic and pulmonary valves control the flow of blood into the__ and ___, respectively?
    Aorta & pulmonary trunk (systemic and pulmonary circuit)
  65. The AV valves are supported by__so that regurgitation of blood into the atria during ventricular contraction does nt occur?
    Chordae tenodineae-tiny white colagen cords also known as heart strings.
  66. Properties of cardiac muscle fibers
    same-striated/contracts by the sliding filament mechanism

    • difference-skeketal-long cylindrical, multinucleated.
    • cardiac-short, fat, branched, interconnected and contains one or at most two pale centrally located nuclei.
  67. What physiological regulation prevents tetanic contractions when the heart beats (which would stop the heart's pumping actions)?
    Absolute refactory period-this period is longer than that of a skeletal muscle(about 200 times greater). this prevents tetanus from occuring and insure that each contraction is followed by enough time to allow the heart chamber to refill with blood before the next contraction
  68. __refers to the entire heart contracting as a unit?
    Functional Syncytium
  69. Th influx of __ ions from extracellular sources is the intiating event in the cardiac muscle contraction?
    calcium
  70. if we were able to artifically alter the membrane permeability of pacemaker cells so that sodium influx is more rapid__?
    threshold is reached more quickly and heart rate would increase
  71. to ausculate the aortic semilunar valve, you would place your sethescope in the __?
    second intercostal space to the right of the sternum
  72. What causes normal heart sounds?
    heart valves closing
  73. how are heart sounds described?
    lub dub.
  74. when do heart sounds occur during the cardiac cycle?
    during the begining and end of ventricular contraction.
  75. the contraction of ventricles that forces blood out of them?
    ventricular systole
  76. the relaxation of ventricles to allow blood to flow back into them?
    ventricular diastole
  77. a measure of how much blood enters th ventricles from atrium?
    EDV-end diastolic volume
  78. the amount of blood remaining in the ventricles after semilunar valves have closed, but before av valves have opened?

    at the end of ventricular contraction
    ESV-end systolic volume
  79. the volume of blood pumped out ot the right or left ventricle per minute.
    cardiac output
  80. During the period of ventricular filling blood flows __through the atria and the open av valves into the ventricles?
    passively
  81. a measure of the pressure that must be overcome for ventricles to eject blood.

    88mmHg in aorta
    8mmHg in pulmonary trunk
    afterload
  82. first phase of ventricular systole. it is the split second when the av valves are forced shut and before the smilunar valves are forced open. the ventricles are completely closed chambers at this time.
    Isovolumetric contraction
  83. __venous return will result in increased end diastolic volume?
    increased
  84. the middle stage of diastole during the cardiac cycle of a heartbeat, wher the initial passive filling of the heart ventricles has slowed down, but before the atria contract to complette the filling?
    diastasis
  85. Stroke volume__if EDV decreases?
    drops
  86. Hemorrhage with a large loss of blood causes a __in BP due to change in cardiac output?
    decrease
  87. factors that increase contractility such as increased calcium levels, hormone & drugs (digitalis)?
    Positive inotropic effects.
  88. factor that decrease contratiliy such as increased levels of potassium, or drugs that lower calcium levels?
    negative inotropic effects
  89. what effect does acetylicholine have on the heart?
    reduces heart rate
  90. what effect does norepinephrin have on the heart?
    increases heart rate
  91. what effect does digitalis have on the heart?
    decreases heart rate
  92. what effect does nicotine have on the heart?
    increases heart rate
  93. the time of day most hazardous for a heart attack?
    morning
  94. Where is the cardiovascular system within the nervous system?
    within the central nervous system, but its ability to contract is intrinsic factor for the heart and does not depend on the nervous system.
  95. what is the role of the vagus nerve?
    decrease heart rate, keep stable at 60-80
  96. if the vagal nerve was cut, what would happen to heart rate?
    increase by 25 bpm
  97. the function of the foramen ovale in the fetal heart?
    connects 2 atria and allows blood entering rt heart to bypass pulmonary circuit and the collapsed nonfunctional fetal lungs.
  98. Blood leaves the right ventricle through__?
    pulmonary semilunar valve
  99. an anatomical arrangement that reduces the risk of myocardial infarction is?
    arterial anastamosis in the coronary circulation
  100. relatively mild blow to the chest that occurs during a vulnerable interval (2ms) when the heart is repolarizing?
    Commotio cords in heart failure.
  101. what occurs when semilunar valves are open
    blood enters pulmonary arteries and the aorta, Av valves are closed, ventricles are in systole.
  102. compared to skeletal muscles the cardiac muscles___?
    has gap junctions that allow it to act as a functional syncytium
  103. during contraction of heart muscle cells__?
    some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores.
  104. atrial systole begins__?
    immediately after P wave
  105. amount of blood coming from one ventricle in one heartbeat is called__?
    stroke volume
  106. a__increases end diastolic volume, stroke volume and force of contraction?
    slow heart rate
  107. Histologocally, the __is squamous epithelium supported by a sparse connective tissue layer.
    Tunica interna (intima)
  108. Which tunic of an artery is most responsible for maintaining blood pressure and continous blood circulation?
    Tunica media
  109. Do all arteries carry oxygenated blood away from the heart?
    In the circulatory circuit all arteries carry oxygenated blood and veins carry deoxygenated blood, in the pulmonary circuit the pulm. arteries carry deoxygenated blood to the lungs and the pulm. veins carry oxygenated blood to the heart.
  110. __permit the exchange of nutrients and gases between the blood and tissue cells?
    capillaries
  111. Why are arterioles also known as resistance vessels?
    • walls of arterioles create friction because of their size (pushes against blood flow)
    • the contraction and relaxation of the smooth muscle in their walls can change their diameter
  112. __are called capacitance vessles or blood reserviors?
    veins because they hold a large amount of blood.
  113. At any given moment, __% of the body's blood is found in veins?
    65
  114. Blood flow through the entire vascular system is equivalent to__?
    Cardiac output
  115. An increase in cardiac output corresponds to a __ in blood pressure, due to the increased delivery.
    decrease
  116. Excess red blood cell production would cause a blood pressure___?
    increase
  117. What factors increase peripheral resistance in a vessel?
    increased blood viscosity, vasoconstriction
  118. What factors decrease peripheral resistance in a vessel?
    anemia, vasodilation
  119. How does the principle of laminar flow apply to blood flowing through a vessel?
    The relative speed and position of fluid or blood will remain constant based on the regions of flow, whether in the center of the vessel or close to the wall.
  120. Pulse pressure is defined as?
    the difference between the systolic and diastolic pressure
  121. capillaries are fragile and high pressures would __them?
    rupture
  122. What will cause arteriole blood pressure to increase?
    increased activity of the musclar and respiratory pumps, increased body temp and size, stressors exercise, trauma, dehydration, high hematocrit, increase in hormones (epi, norepi, antidiuretic and angiotensin II) decrease in atrial natriuretic peptide, heart rate and cardiac output.
  123. what are the factors that aid in venous return?
    respiratory pump-as we inhale abd pressures increase and force blood towards heart and allow thoracic veins to expand, speeding the blood entry to the atrium, muscular pump squeezes veins forcing blood to move forward, cardiac suction during ventricular systole.
  124. What are the factors that result in the dialation of the feeder arterioles and opening the precapillary sphincters in the systemic capillary beds?
    chemical conditions in the body or in the specific location of a capillary bed and arteriolar vasomotor nerve fibers determine the opening of the precapillary sphincters.
  125. Where are the barorecptors located? what rea they sensitive to?
    located in the carotid sinus and aortic arch. sensitive to arterial blood pressure
  126. What is the long term mechanism of blood pressure regulation?
    renal regulation, where the kidneys provide a hormonal mechanism for regulation of blood pressure by maintaining blood volume.
  127. What is a normal blood pressure reading? What blood pressure reading would be indicative of hypertension?
    • normal 120/80
    • hypertensive 140/90
  128. What are possible causes of primary hypertension?
    Heredity, diet, obesity, age, diabetes mellitus, stress, smoking
  129. What are possible causes of secondary hypertension?
    obstruction of renal arteries, kidney disease, endrocrine disorders, arteriosclerosis
  130. What is tissue perfussion? How is MAP and estimate?
    • blood flow through the body tissues, which involve delivery of nutrients and gases and removal of waste products.
    • MAP is the amount of pressure reaching the capillaries and organs.

    (SP-DP=) divided by 3 + diastolic pressure
  131. What vessel type has the slowest velocity of blood flow?
    capillaries
  132. What vessel type has the fastest velocity of blood flow?
    Aorta and large arteries
  133. How is cerebral blood flow regulated?
    intrinsic autoregulatory mechanisms-one of the bodies most precise autoregulatory systems and is tailored to local neuronal needs.
  134. To what chemicals does the brains autoregulation respond?
    Declining PH and increased CO2 levels.
  135. How is blood flow to the skin regulated?
    autoregulation and neural intervention. increases when environmental temps rise
  136. Where in the body would you find low oxygen levels causing vasoconstriction and high levels causing vasodilation?
    lungs
  137. Water enters the blood capillaries by means of__?
    osmosis
  138. The net filtration pressure of a blood capillary is the differnece between?
    net hydrostatic pressure and oncotic pressure
  139. What two pressures regulate capillary dynamics?
    hydrostatic pressure and colloid osmotic pressure.
  140. normal average blood pressure of a newborn?
    90/55
  141. Inadequate pumping activity of the heart is likely to cause__?
    Cardiogenic shock
  142. Positive feedback is most important in __?
    Decompensated shock.
  143. In autorgulation, what chemicals tend to increase blood flow?
    Nitric oxide, carbon dioxide, histamine, lactic acid
  144. found in the skin and muscles, endothelial cell is continuous, allow small solutes to pass through them, most capillaries are of this type.
    Continuous capillaries
  145. found in the small intestines, kidneys and endocrine glands, their cells have pores and openings to allow greater permeability?
    Fenestrated capillaries
  146. found in liver, bone marrow, lymphoid tissue, they are leaky, highly permeable capillaries, lined with phagocytes?
    Sinusoids (sinusoidal capillaires)
  147. 3 main factors influencing blood pressure?
    cardiac output, peripheral resistance, blood volume
  148. chemicals that regulate blood pressure?
    AHD, atrial natriuretic peptide, angiotnesion II
  149. circulatory route the runs from the digestive tract to the liver is called __?
    Hepatic portal circulation
  150. include aorta and other nearby branches, largest arteries, able to smooth blood flow. (conducting)
    Elastic arteries
  151. (distributing) distribute blood to the various body regions, regulate blood flow by vasoconstriction or vasodilation, ex:brachial, femoral, splenic arteries.
    Muscular arteries.
  152. have all 3 tunics in their walls, arterioles are the smallest. 3 types: arteriole, terminal and metarterioles.
    Restitance arteries.
  153. aldosterone will__?
    promote an increase in blood pressure
  154. a late sign of hypovolemic shock?
    rapidly falling blood pressure
  155. what is likely during vigorous exercise?
    capillaries of the active muscles will be engorged.
  156. In the dynamics of blood flow through capillaries, hydrostatic pressure__?
    is the same as capillary blood pressure
  157. the term ductus venosus refers to __?
    a special fetal vessel that allows umbilical blood to bypass the liver
  158. What influences atrial pulse rate
    activity, postural changes, emotions
  159. The arteries that directly feed into capillary beds are called__?
    arterioles
  160. The velocity of blood flow is__
    slowest in the capillaries because the total cross sectional ares if the greatest.
  161. A thrombus in the first bransh of the arch of the aorta would affect the flow of blood to the__?
    right side of the head and neck and right upper arm
  162. essential hypertension could result in?
    increased work of the lt ventricle, increased incident of coronary artery disease and increased damage to blood vessel endothelium
  163. What do the ductus aretiousus and formaen ovale become at birth?
    ligamentum arteriosum and fossa oavlis

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