Increased venous return results ina. increased stroke volume. c. decreased heart rate.b. increased cardiac output. d. Both a and b are correct

Which of the following is true regarding the conduction of electrical activity in the heart? Choose the best answer. a. Conduction through the AV node is relatively slow b. The wave of depolarization travels directly from the atrial muscle to the ventricular muscle c. The AV node determines heart rate in a healthy person d. 2 of the options are correct e. None of the options are correct

It is generally accepted that a relatively low diastolic vascular pressure is more important than a relatively low systolic vascular pressure because: A. diastolic vascular pressure is the pressure that determines the length of diastole. B. diastolic vascular pressure directly determines stroke volume. C. diastolic vascular pressure ultimately determines and controls contractility. D. diastolic vascular pressure is a force the heart must compete with to open the aortic valve. E. None of the above is correct.

a. Only between cardiac cycles b. Ventricular diastole c. Ventricular systole d. Throughout the cardiac cycle

Cardiac output is: A. The volume of blood pumped over a period of time. B. The stroke volume times the peripheral resistance. OC. Governed by the Nernst equation. D. All of the above. O E. None of the above.

An increase in extracellular potassium levels can causea. an increase in stroke volume.b. an increase in force of contraction.c. a decrease in heart rate.d. Both a and b are correct.

The Frank-Starling Law says that stroke volume a. is constant b. increases with deceased blood pressure c. increases with increased venous return d. increases with afterload e. increases with heart rate

In the aorta, Select one: a. the resistance to blood flow is high, but velocity of blood flow is low. b. the velocity of blood flow is high, but blood pressure is low. c. velocity is diminished because the total cross-sectional area is small. d. the blood pressure and blood velocity are both high. e. the resistance to blood flow and the blood pressure are both low.

The period of ejection: A. begins with closure of the AV-valves and ends with opening of the AV- valves B. begins with opening of the aortic valve and ends with closure of the aortic valve C. begins with the P-wave and ends with the QRS-complex D. begins with the QRS-complex and ends with the T-wave

During emergency situations, even if the nerves to the heart have been severed, the heart rate will: Select one: a. stay the same. b. decrease. c. increase. d. lead to hypotension.