WCU PHYS 261 FINAL QUESTIONS & 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 - Answers -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+ - Answers -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 - Answers -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 - Answers -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. - Answers -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. - Answers -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 - Answers -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 - Answers -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 - Answers -B. QRS complex
The function of transverse tubules is to
a. conduct ATP molecules out of the mitochondria throughout the sarcoplasm.
b. ensure a supply of glycogen throughout the muscle sarcoplasm.
c. store Ca2+ ions inside the muscle fiber.
, d. rapidly move action potentials to the interior of the muscle fiber. - Answers -d.
rapidly move action potentials to the interior of the muscle fiber.
Which is greater?
a. blood pressure when the peripheral vessels constrict
b. blood pressure when the peripheral vessels dilate - Answers -a. blood pressure
when the peripheral vessels constrict
The P wave of an ECG corresponds to
a. the progressive wave of ventricular
b. depolarization.
c. depolarization of the atria.
d. repolarization of the atria.
e. repolarization of the ventricles.
f. None of the answers are correct. - Answers -c. depolarization of the atria.
The reflex that complements a withdrawal reflex by making compensatory adjustments
on the opposite side of the body receiving the stimulus is the
a. stretch reflex.
b. flexion reflex.
c. crossed extensor reflex.
d. reciprocal reflex.
e. tendon reflex. - Answers -c. crossed extensor reflex.
Your instructor announces a pop quiz. Which would you expect?
a. Increased parasympathetic signaling and decreased cardiac output
b. Increased parasympathetic signaling and increased cardiac output
c. Increased sympathetic signaling and decreased cardiac output
d. Increased sympathetic signaling and increased cardiac output - Answers -d.
Increased sympathetic signaling and increased cardiac output
This protein is activated by the Ca2+-calmodulin complex to phosphorylate the myosin
light chain protein.
a. myosin heavy chain
b. myosin light chain phosphatase
c. tropomyosin
d. myosin light chain kinase - Answers -d. myosin light chain kinase
In which situation would end-systolic volume (ESV) be the greatest?
a. when parasympathetic stimulation of the heart is increased
b. when the intracellular stores of calcium are increased
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 - Answers -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+ - Answers -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 - Answers -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 - Answers -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. - Answers -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. - Answers -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 - Answers -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 - Answers -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 - Answers -B. QRS complex
The function of transverse tubules is to
a. conduct ATP molecules out of the mitochondria throughout the sarcoplasm.
b. ensure a supply of glycogen throughout the muscle sarcoplasm.
c. store Ca2+ ions inside the muscle fiber.
, d. rapidly move action potentials to the interior of the muscle fiber. - Answers -d.
rapidly move action potentials to the interior of the muscle fiber.
Which is greater?
a. blood pressure when the peripheral vessels constrict
b. blood pressure when the peripheral vessels dilate - Answers -a. blood pressure
when the peripheral vessels constrict
The P wave of an ECG corresponds to
a. the progressive wave of ventricular
b. depolarization.
c. depolarization of the atria.
d. repolarization of the atria.
e. repolarization of the ventricles.
f. None of the answers are correct. - Answers -c. depolarization of the atria.
The reflex that complements a withdrawal reflex by making compensatory adjustments
on the opposite side of the body receiving the stimulus is the
a. stretch reflex.
b. flexion reflex.
c. crossed extensor reflex.
d. reciprocal reflex.
e. tendon reflex. - Answers -c. crossed extensor reflex.
Your instructor announces a pop quiz. Which would you expect?
a. Increased parasympathetic signaling and decreased cardiac output
b. Increased parasympathetic signaling and increased cardiac output
c. Increased sympathetic signaling and decreased cardiac output
d. Increased sympathetic signaling and increased cardiac output - Answers -d.
Increased sympathetic signaling and increased cardiac output
This protein is activated by the Ca2+-calmodulin complex to phosphorylate the myosin
light chain protein.
a. myosin heavy chain
b. myosin light chain phosphatase
c. tropomyosin
d. myosin light chain kinase - Answers -d. myosin light chain kinase
In which situation would end-systolic volume (ESV) be the greatest?
a. when parasympathetic stimulation of the heart is increased
b. when the intracellular stores of calcium are increased
