Lec 3 phys exam

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Lec 3 phys exam
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2012-04-22 22:52:43
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Lec 3 phys exam
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  1. The property of muscle tissue that allows it to return to its original shape after stretching or contracting is called:
    Elasticity
  2. The property of muscle tissue that describes its ability to receive and respond to stimuli is:
    Excitability
  3. The function of Ca+ in skeleton muscle contractions is to do what:
    Bind to tropin on the thin myofilaments so that myosin binding on actin can be exposed
  4. What structures meat the NMJ:
    Axon and sarcolemma
  5. The function of myoglobin is to
    Bind O2 for aerobic respiration
  6. The purpose of the phosphogen system is to
    Store the high energy
  7. The sustained partial contraction of a portion of a skeletal muscle is called:
    Tonus
  8. A motor unit is:
    A motor neuron plus all skeletal muscle fibers it stimulates
  9. The synaptic vesicles seen in an axon terminal at a NMJ contain
    Acetylcholine
  10. Sarcomeres are separated from each other by the
    Z disc
  11. The term power stroke when used relative to skeletal muscle contraction refers to the
    Swiveling of the myosin heads as they combine with actin
  12. The function of acetylcholine esterase
    Breakdown of acetylcholine
  13. What is happening during the latent period of a muscle contraction?
    Open calcium channels in the sarcoplasmic recticulum that Ca+ can diffuse in sarcoplasma
  14. A sustained muscle contraction that lacks even partial relaxation between stimuli is referred to as
    Incomplete tetanus
  15. Thin filaments contain
    Actin, troponin, and tritomyosin but not myosin
  16. The all or nothing principle of skeletal muscle contraction states that
    All of the muscle cells of an individual motor unit will contract to fullest extent or not at all
  17. During depolarization phase of an action potential, which of the following situations exist?
    The inside membrane becoming more positive with respect to outside
  18. During repolarization phase action potential which situation exists?
    The inside of membrane become more negative with respect to outside
  19. When the ions are moving across the membrane during the depolarization and repolarization phases of an action potential they are moving by:
    Simple diffusion
  20. Which of the following events occur first in an action potential:
    Depolarization
  21. The term saltatory conduction refers to the:
    Conduction of a nerve impulse along a myelinated axon
  22. Neurotransmitters control the passage of ions through
    Chemically gated channels
  23. The absolute refractory period for a neuron is the time
    During which a second action potential cannot be initiated no matter how strong the stimulus
  24. Local anesthetics such as procaine and lidocaine block pain sensations by
    Preventing opening of voltage gated N+ channels
  25. Action potentials occur only when
    Voltage gated ion channels open
  26. Which of the following lists, is the components of reflex arc in correct order of functioning?
    Receptor, sensory neuron, integrating center, motor neuron, effector
  27. The contralateral reflex that helps you maintain balance when the flexor reflex is initiated is
    Crossed (leg) extensor reflex
  28. Tapping the knee during physical exam tests for the patellar reflex
    Stretch reflex
  29. An epislateral monosynaptic reflex that is important in maintaining muscle tone and muscle coordination during exercise is
    Stretched reflex
  30. Which of the following occurs when trying to focus on a close object?
    Contraction of the ciliary muscle to make the lens more convex
  31. The first step in visual transduction is
    Absorption of light by photo pigment in rods and cones
  32. When your mother told you to eat your carrots she was giving you good advice because carrots contain carotinoids necessary for the formation of
    Photo pigment s of the retina
  33. When stapes moves back and forth it directly causes what
    The oval window to move in and out
  34. Which of the following events of hearing occurs first?
    The tympanic membrane vibrates
  35. A scratch on the cornea most directly interferes with
    Refraction
  36. Causes of respiratory alkalosis?
    A and B (hyperventilation and aspirin overdose)
  37. The 2 hormones that regulate reabsorption in the final portion of the DCT and collecting ducts are
    Aldosterone and antidiuretic hormone (ADH)
  38. The permeability of the collecting ducts to H2O is regulated by
    Antidiuretic hormone (ADH)
  39. In the proximal convoluted tubule symporters that use the Na+ concentration difference are responsible for reabsorption of
    Both glucose and amino acids
  40. Filtration of blood in the glomerular is promoted by
    Blood hydrostatic pressure
  41. All of the following are normally found in urine except
    Glucose
  42. The forces that oppose filtration of substances from the glomerular capillaries into the glomerular (Bowmans space)
    B and D (blood colloid osmotic pressure and capsular hydrostatic pressure)
  43. Levels of Na+ in the blood are regulated by
    Aldosterone also ADH and ANP
  44. Which of the following would serve to buffer H+
    HCO3- (bicarbonate)
  45. Hypokalemia is what
    Low plasma level of K+
  46. Which of the following is not an important rule for Ca+ in the body?
    Buffer for metabolic acid
  47. An ion that acts as a cofactor to Na+/K+ adipose is
    Magnesium
  48. The sweet odor of diabetic urine is due to the presence of
    Ketone bodies
  49. An ion channel that opens and responds to direct changes in the membrane potential ______channel.
    Voltage-gated
  50. A membrane whose polarization is more than the resting level is said to be ________.
    Hyperpolarized
  51. Rapid opening of voltage-gated sodium ion channels brings about _______
    Depolarization
  52. Recovery of the resting potential due to opening o voltage gated ion channels and closing of voltage-gated ion channels _______
    Repolarization
  53. The synaptic of function contact between two neurons or between neuron effectors_______
    Synapse
  54. Binding of light rays as they pass through a different media is called______
    Refraction
  55. The increase in the curvature of the lens of near vision is called______
    Accommodation
  56. With aging the lens looses elasticity and therefore its ability to change shape this condition is_______
    Prespyopia
  57. The medial movement of the eyeball so that both are directed toward the object is called______
    Convergence
  58. The photo pigment in the rods is ______
    Rhodopsin
  59. Sound intensity is measured in units called______
    Decibels
  60. When daily urine output is less than 50ml per day the condition is known as ______
    Anuria
  61. The movement of the material from the tubular fluid is called______
    Tubular reabsorption
  62. The amount of filtrate forms in the amino capsule in both the kidney and _______
    Glomerular filtration rate
  63. GBHP – (CHP + BCOP), when GBHP = glomembular blood hydrostatic pressure. CHP = Capsular HSP + BCOP = blood colloid osmotic pressure is the
    Net filtration pressure
  64. The primary method by which water moves between fluid compartments is______
    Osmosis
  65. One kidney test screening ________ measures the level of nitrogen in the urine as part of urea.
    Blood urea nitrogen
  66. The homeostatic range Ph for extra cellular fluid is ______
    7.35 - 7.45
  67. A admits and refracts lights B refract light C provides blood supply, absorbs scattered light D regulates amount of light that enters the eye
    • A cornea
    • D iris
    • B lens
    • C choroid
  68. Two genes that code for the same trait and are in the same location on homologous chromosomes are reffered to as alleles
    True
  69. The genetic make up of the organism is called the genotype
    True
  70. The traits that are expressed are called the phenotype
    True
  71. Females have 2 chromosomes designated as X
    True
  72. Males have X and Y chromosomes
    True

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