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PHYS 261 FINAL EXAM QUESTIONS AND ACTUAL ANSWERS.
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Match each term with its definition. A. cardiac output (CO) B. heart rate (HR) C. end-diastolic volume (EDV) D. stroke volume (SV) E. end-systolic volume (ESV)the volume of blood pumped out of the heart from one ventricle during one contraction - Answer D. stroke volume (SV) The ra...

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  • February 8, 2025
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  • 2024/2025
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PHYS 261 FINAL EXAM QUESTIONS
AND ACTUAL ANSWERS.
Match each term with its definition.



A. cardiac output (CO)

B. heart rate (HR)

C. end-diastolic volume (EDV)

D. stroke volume (SV)

E. end-systolic volume



(ESV)the volume of blood pumped out of the heart from one ventricle during one contraction - Answer
D. stroke volume (SV)



The rapid depolarization phase of the action potentials of myocardial contractile cells is due to which
ion(s)?



Ca2+ only

K+ only

Na+ only

both Ca2+ and K+

both Na+ and K+ - Answer Na+ only



Match each term with its definition.



A. cardiac output (CO)

B. heart rate (HR)

C. end-diastolic volume (EDV)

D. stroke volume (SV)

,E. end-systolic volume (ESV)



the volume of blood in the ventricle available to be pumped out of the heart during one contraction -
Answer c. end-diastolic volume (EDV)



Match each term with its definition.



A. cardiac output (CO)

B. heart rate (HR)

C. end-diastolic volume (EDV)

D. stroke volume (SV)

E. end-systolic volume (ESV)



the volume of blood left in the ventricle after it contracts - Answer E. end-systolic volume (ESV)



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



end-diastolic volume.

stroke volume.

cardiac reserve.

cardiac output.

end-systolic volume. - Answer stroke volume.



What happens when calcium binds troponin?



Troponin binds to actin and causes sarcomere shortening.

Troponin changes shape and covers the SR calcium channel, which is a form of negative feedback.

Tropomyosin is pulled away from the myosin-binding site on actin.

, Troponin releases myosin and activates actin. - Answer Tropomyosin is pulled away from the myosin-
binding site on actin.



The driving force for blood flow is a(n) ________ gradient.



gravity

pressure

osmotic

volume - Answer pressure



Which would NOT cause an increase in blood pressure?



an increase in arterial resistance

a decrease in cardiac output

a decrease in arterial diameter

an increase in sympathetic activity - Answer a decrease in cardiac output



Match the name of the wave with the correlated event.



A. P wave

B. QRS complex

C. T wave

D. PR segment

E. ST segment



ventricular depolarization - Answer B. QRS complex



The function of transverse tubules is to

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