Chapter 17: Cardiac Function

Chapter 17: Cardiac Function

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. Which is true about the mitral valve?

ANS:  D

The mitral valve directs blood flow from the left atrium to the left ventricle. Papillary muscles prevent the valve leaflets from opening during ventricular contraction. The mitral valve is located between the left atrium and left ventricle. The tricuspid valve has three leaflets; the mitral valve has two.

REF:   Pg. 350

2. Blood is transported from the right ventricle to the lungs by the

ANS:  C

Deoxygenated blood is received from the right side of the heart and pumps it through the lungs by way of the pulmonary artery. Blood is delivered to the left atrium by the pulmonary veins. The aorta supplies the arteries of the systemic circulation. Blood is not transported to the lungs by way of the bronchial arteries.

REF:   Pg. 352

3. A vessel that normally contains desaturated (venous) blood is the

ANS:  B

The right side of the heart receives deoxygenated blood from the systemic circulation and pumps it through the lungs by way of the pulmonary artery. The bronchial artery is not involved in venous blood flow. The pulmonary vein carries oxygenated blood. Blood supply to the heart is provided by coronary arteries.

REF:   Pg. 352

4. During which phase of the cardiac cycle is the mitral valve normally open?

ANS:  A

The mitral valve is open during the period of ventricular contraction, which is the period of systole. Isovolumic contraction is a period immediately following atrial systole. The isovolumic relaxation phase begins with semilunar valve closure in response to falling ventricular pressures and ends when the AV valves open to allow ventricular filling. Ventricular contraction results in a rapid rise in ventricular pressure. As ventricular pressure exceeds aortic pressure (or pulmonic), the valve is forced open and a period of rapid ejection of blood from the ventricle follows.

REF:    Pgs. 352-355