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PHYS 261-Human Physiology Mid Term Exam With Latest Updated (Questions And Answers
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PHYS 261-Human Physiology Mid Term Exam With Latest Updated (Questions And Answers
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PHYS 261-Human Physiology Mid Term Exam WithLatest Updated (Questions And Answers).
Match each term with its definition. (ESV)the volume of blood pumped out of the
heart from one ventricle during one contraction - ANSWER 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. the volume of blood in the ventricle available to
be pumped out of the heart during one contraction - ANSWER end-diastolic
volume (EDV)
Match each term with its definition. the volume of blood left in the ventricle after it
contracts - ANSWER 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 decrease in cardiac output
Match the name of the wave with the correlated event.- ventricular depolarization -
ANSWER 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. - ANSWER
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 - ANSWER 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. - ANSWER 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. - ANSWER 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 - ANSWER
Increased sympathetic signaling and increased cardiac output
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