CARDIOVASCULAR SYSTEM, THE HEART

True

A slow heart rate increases end diastolic volume, stroke volume and force of contraction

medulla oblongata

The cardiovascular centers are located in which area of the brain?

closing of the atrioventricular valves

The first heart sound represents which portion of the cardiac cycle?

afterload

The force the heart must overcome to pump blood is known as ________.

calcium

The influx of which ion accounts for the plateau phase?

ventricular repolarization

Ventricular relaxation immediately follows ________.

it decreases

What happens to preload when there is venous constriction in the veins?

pericardium

What is the double-walled sac covering the heart termed?

It delivers 5% of the body's blood supply to the heart muscle

What purpose does the coronary circuit serve?

right atrium

Which chamber initially receives blood from the systemic circuit?

bicuspid

Which valve separates the left atrium from the left ventricle?

tricuspid, pulmonary semilunar, bicuspid, aortic semilunar

list the valves in order of a blood cell that enters from the vena cava would encounter them before this blood cell would leave for the systemic circulation?

sinoatrial node

what is responsible for setting the heart's pace?