S'24 BIOL65 Heart

What structure divides the left and right atria?

• auricles

• interatrial septum

• interventricular septum

• aortic valve

Which is the deepest layer of the pericardium?

• fibrous pericardium

• visceral serous layer

• endocardium

• parietal serous layer

Blood enters the right atrium through the ________.

• right AV valve

• pulmonary trunk

• superior and inferior vena cavae

• pulmonary arteries

The left coronary artery and right coronary artery branch off the _____.

• aorta

• pulmonary trunk

• superior vena cavae

• inferior vena cavae

After the sinuatrial (SA) node fires an electrical signal through the heart's atrium, which heart structure fires electrical signals next

• atrioventricular (AV) node

• purkinje fibers

• atrioventricular (AV) bundle

• fossa ovalis

What fetal heart structure allows blood to flow from the right to left atria?

• ductus arteriosus

• small cardiac vein

• left marginal vein

• foramen ovale

Regurgitation is most likely the direct result of what condition in the heart?

• pericarditis

• myocardial infarction

• valvular defects

• myocardial hypertrophy