Card Set Information
Which lung will be a little smaller than the other?
Superficial fibrous pericardium
protects, anchors, and prevents overfilling
visceral layer (epicardium)
external surface of the heart
fluid filled that decreases friction
visceral layer of serous pericardium
main wall of heart (muscle)
Fibrous skeleton of the heart
Chordae tendonae and heart valves that anchor cardiac muscle fibers and support
continuous with endothelium
Cardiac muscle bundles
gernates force to push blood out of the heart
what seperates the two ventricles?
what increase atrial volume?
walls are ridged by pectinate muscles and thin
vessels entering right atrium
superior vena cava, inferior vena cava, and coronary sinus
vessels entering left atrium
right and left pulmonary veins
walls are ridged by trabeculae carneae and papillary muscles project into the ventricular cavities
vessel leaving the right ventricle
vessel leaving the left ventricle
which ventricle has the most muscles in the wall?
systemic arteries are rich in ______ and low in _____
rich oxygen, low carbon dioxide
systemic veins are ____ in oxygen and _____ in carbon dioxide
low in oxygen, rich in co2
which way do arteries carry blood
away from the heart
what is used to prevent prolapse?
where do veins carry blood?
back to the heart
how long does it take to complete one circuit of blood when at rest?
Pathway of blood through the heart
pulmonary semilunar valve
aortic semilunar valve
Are equal volumes of blood pumped to the pulmonary and systemic circuits?
short, low pressure circulation (1/3 of systemic pressure)
blood encounters much resistance in the long pathways of high pressure
The interventricular septum works like what ventricle?
coronary arteries get blood from where?
Does coronary circulations function aerobicly?
the functional blood supply to the heart muscle itself
What is the common receiving center from all other veins?
thoracic pain, cells are weakend, with rest strength can be regained
myocardial infarction (heart attack)
prolonged coronary blockage that almost always involves ventricles (cells die)
What is the first step of the Cardiac cycle?
atrial systole and ventricular diastole
What is the 2nd step of the cardiac cycle?
ventricular systole and atrial diastole
What is the last step of the cardiac cycle
atrial and ventricular diastole
Which of the three steps in the cardiac cycle last the longest?
The last step (3rd step)
heart actively contracting
prevent backflow into the atria, tricuspid valve and mitral valve
prevent backflow into the ventricles, aortic and pulmonary semilunar valve
lowest pressure on average is in the atriums or ventricles?
is cardiac muslce aerobic or anaerobic?
size of skeletal muscle cells
size of cardiac muscle cells
What is the connective tissue matrix that connects to the fibrous skeleton?
what makes up a large volume of a cell
What does the mitochrondria do for a cell
performs cell respiration to give cardiac muscle oxygen
junctions between cells anchor cardiac cells
prevent cells from seperating during contraction
allow ions to pass, electrically couple adjacent cells