Circulation 1

Valves work ______ to allow flow of blood in ______ direction(s)

• actively, just one

• passively, just one

• actively, two

• pasisvely, two

systole means _____ and diastole means ____

• contraction, relaxation

• contraction, contraction

• relaxation, relaxation

• relaxation, contraction

Which valves are open in late diastole?

• Va valve

• AV valve

• vA

What stage in the cardiac cycle directly follows atrial contraction?

• Early diastole

• Early systole

• Laste systole

• Late diastole

What causes the atrium to contract?

• Increased blood in the ventricles

• Increased blood in the atria

• SA node hyperpolarization

• The closing of the AV valve

What is characteristic about early systole?

• First heart sound

• Isovolumetric relaxation

• AV valve is open

• Va valve is open

What is characteristic about late systole?

• Ventricular pressure is greater than atrial

• Va valve is closed

• AV valve is closed

• Ejection into artery occurs

What is characteristic about early diastole?

• The ventricle contracts

• AV valve is closed

• Pressure in the ventricle is decreasing

• Va valve is closed

Which of the following would produce a heart murmur?

• Blood flowing through a dilated vessel

• Blood flowing from ventricle to atrium

• Blood flowing from atrium to ventricle

• Blood flowing from ventricle to pulmonary arteries

Electrical activity is important to the heart because it ultimately allows contraction. Which cells are the main sources of this electricity?

• Myosin cells

• Cardiac cells

• skeletal cells

• pacemakers