4. Which are true of stroke volume? Choose all correct. (20) a. it is the volume

ID: 163145 • Letter: 4

Question

4. Which are true of stroke volume? Choose all correct. (20)

a. it is the volume per contraction ejected per ventricle

b. an average resting value for stroke volume is 70 mL/beat

c. cardiac output is directly related to stroke volume

d. Mathematically, stroke volume is equal to EDV-ESV

5. Heart sound 2 (choose all correct) (20)

a. is generated by the closing of the atrioventricular valves

b. occurs when the aortic and pulmonary valves backfill with blood

c. marks the beginning of isovolumic relaxation

d. is associated with turbulence during atrial contraction

6. If a person’s heart rate is 100 bpm and their ventricle is ejecting 50 mL/beat, their cardiac output is ________liters/min. (10)

7. Factors that INCREASE stroke volume are (choose all correct) (20)

a. an increase in skeletal muscle activity

b. sympathetic activity to constrict veins

c. the expiratory phase of respiration

d. increased afterload in the form of hypertension

4. (A)

stroke volume (SV) is the volume of blood pumped from the left ventricle per beat.

5. (B)

Heart sound 2 results from aortic and pulmonic valve closure.

6. 5(L/min)

Cardiac output (L/min) = SV(L/beat)*Heart rate (beat/min)

= 100*50

5000 ml/min = 5(L/min)

cardiac output, Q. Cardiac output is classically defined alongside stroke volume (SV) and the heart rate (HR)

7. (A,B and D) are correct options

Several factors such as heart size, contractility, duration of contraction, preload (end-diastolic volume), and afterload

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