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.
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.
