ch 20 test Flashcards
collects blood from systemic circuit
right atria
pumps blood to pulmonary circuit
right ventricle
collects blood from pulmonary circuit
left atria
pumps blood into systemic circuit
left ventricle
visceral pericardium
inner layer of pericardium
parietal paricardium
outer layer that forms inner layer of paricardial sac
coronary sulcus
divides atria and ventricles
anterior and posterior interventricular sulcus
seperate left and right ventricles, contain blood vessels and cardiac muscle
epicardium
outer layer, visceral pericardium, covers the heart
atrioventricular valves (AV valves)
connect right atrium to right ventricle and left atrium to left ventricle
Blood pressure closes valve cusps during ventricular contraction
Papillary muscles tense chordae tendineae to prevent valves from swinging into atria
right atrium vessels
superior vena cave, inferior vena cava, and coronary sinus
superior vena cava
recieves blood from head, neck, upper limbs, and chest
inferior vena cava
recieves blood from trunk, viscera, and lower limbs
foramen ovale
Before birth, is an opening through interatrial septum
Connects the two atria
Seals off at birth, forming fossa ovalis
Pectinate muscles
Contain prominent muscular ridges
On anterior atrial wall and inner surfaces of right auricle
right AV valve
tricuspid valve
Trabeculae carneae
Muscular ridges on internal surface of right (and left) ventricle
Conus arteriosus
superior end of right ventricle) leads to pulmonary trunk
left atrioventricular (AV) valve
A two-cusped bicuspid valve or mitral valve
The Left Ventricle
Similar internally to right ventricle but does not have moderator band
Blood leaves left ventricle through aortic valve into ascending aorta
Structural Differences between the Left and Right Ventricles
Right ventricle wall is thinner, develops less pressure than left ventricle
Right ventricle is pouch-shaped, left ventricle is round
Semilunar valves
Pulmonary and aortic tricuspid valves
Prevent backflow from pulmonary trunk and aorta into ventricles
Have no muscular support
Three cusps support like tripod
The Cardiac Skeleton
Four bands around heart valves and bases of pulmonary trunk and aorta
Stabilize valves
Electrically insulate ventricular cells from atrial cells
