PHYS 261 FINAL EXAM Question and Correct Answers/ Latest Update 2025

PHYS 261 FINAL EXAM Question and
Correct Answers/ Latest Update 2025
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

Ans: 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+

Ans: 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

Ans: 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

Ans: 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.

Ans: 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.

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



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