chapter 20

The following is a list of vessels and structures that are associated with the heart. What is the correct order for the flow of blood entering from the systemic circulation? 1. right atrium 2. left atrium 3. right ventricle 4. left ventricle 5. venae cavae 6. aorta 7. pulmonary trunk 8. pulmonary veins

5, 1, 3, 7, 8, 2, 4, 6

An increase in the rate of action potentials from baroreceptors will trigger a reflex to

both decrease heart rate and decrease pressure

What factor will decrease cardiac output?

parasympathetic stimulation

Stroke volume depends on

the pressure required to pump blood into aorta all contractility of the ventricle venous return of blood to the heart end diastolic volume (all of the above)

The long plateau phase of the cardiac muscle action potential is due to

calcium channels remaining open

The atrioventricular valves permit blood flow

in one direction only

In cardiac muscle, the fast depolarization phase of the action potential is the result of

increased membrane permeability to sodium ion (Na+)