quiz questions and answers

5. ​In a normal heart, what is the average amount of blood that's left in the ventricle at the end of systole when ejection is complete?​

65mL

8. If the cardiac output is 4,800 ml/min and the heart rate is 60 beats per minute, the stroke volume averages ____ ml.

80

13. Vasodilation of coronary arteries is induced by

adenosine nitroglycerin nitric oxide

4.Which factor(s) would decrease cardiac output?

decreased preload

19. The major determinant influencing resistance to blood flow is the

radius of the vessel through which the blood is flowing

14. The cardiac muscle

receives most of its blood supply during ventricular diastole by means of coronary arteries

1. The volume of blood ejected from each ventricle during a contraction is called the

stroke volume

If the blood pressure is recorded as 118/76, indicate the correct value of the pressure in question by writing the appropriate letter in the blank using the following answer code:

systolic = 118 mmHg diastolic = 76 mmHg pulse pressure = 42 mmHg MAP= 90 mmHg

7. ​What is a murmur called when it occurs between the first and the second heart sounds?

systolic murmur

21. During exercise, an increase in CO2 and decrease in O2 will lead to vasodilatation of the skeletal muscle blood vessels by active hyperemia.

true

18. Resistance increases when

vessel radius decreases

2. ​What is cardiac output?

​volume of blood pumped by each ventricle per minute

3. ​What are the two determinants of cardiac output?

​volume of blood pumped by each ventricle per minute

12. During isovolumetric contraction,

- All valves are closed - no blood enters or leaves the ventricles

16. Sympathetic stimulation of the heart

- increases the heart rate - increases the heart's contractility - shifts the Frank-Starling curve to the left

15. Parasympathetic innervation to the heart

- involves the vagus nerve - decreases the rate at which the pacemaker potential reaches threshold - decreases the strength of ventricular contraction

10. During heart failure,

- the heart pumps out a smaller stroke volume than normal for a given EDV - a compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease

6. ​What is the second heart sound associated with?

closure of semilunar valves

20.Which of the following is the correct relationship between pressure, flow, and resistance?

flow = pressure gradient/resistance

11. Which of the following is not associated with an increase in stroke volume?

increased end-systolic volume

9. According to the Frank-Starling law of the heart,

increasing venous return increases EDV, which leads to an increased stroke volume

17. At rest, which of the following receives the most blood flow?

kidney