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WCU PHYS 261 FINAL EXAM ACTUAL EXAM 2 LATEST VERSIONS A AND B EACH VERSION CONTAINS 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES|AGRADE$17.99
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WCU PHYS 261 FINAL EXAM ACTUAL EXAM 2 LATEST
VERSIONS A AND B EACH VERSION CONTAINS 100
QUESTIONS AND CORRECT DETAILED ANSWERS WITH
RATIONALES|AGRADE
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)? - ANSWER: Na+ only
The volume of blood in the ventricle available to be pumped out of the heart during
one contraction - ANSWER: End- diastolic volume (EDV)
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 - ANSWER:
Stroke volume (SV)
What happens when calcium binds to troponin? - ANSWER: Tropomyosin is pulled
away from the myosin-binding site on actin.
The driving force for blood flow is a(n) ________ gradient. - ANSWER: pressure
Which would NOT cause an increase in blood pressure? - ANSWER: a 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 - ANSWER: rapidly conduct 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: A) blood pressure
when the peripheral vessels constrict
The P wave of an ECG corresponds to - ANSWER: depolarization of the atria
The reflex that compliments a withdrawal reflex by making compensatory
adjustments on the opposite side of the body receiving the stimulus is the -
ANSWER: crossed extensor reflex
, Your instructor announces a pop quiz. Which would you expect? - ANSWER:
Increased sympathetic signaling and increased cardiac output
This protein is activated by the Ca2+-calmodulin complex to phosphorylate the
myosin light chain protein. - ANSWER: myosin light chain kinase
In which situation would end- systolic volume (ESV) be the greatest? - ANSWER:
when parasympathetic stimulation of the heart is increased
Striated muscles are so- called because of a repeating pattern of light and dark
bands. One repeating unit of the banding pattern is called a - ANSWER: Sarcomere
The contraction cycle is initiated by the rise in _______ released from the
sarcoplasmic reticulum (SR). - ANSWER: Ca2+
The cardiac output is equal to the - ANSWER: product of heart rate and stroke
volume
The importance of the plateau phase of the action potential of myocardial cells is in -
ANSWER: preventing tetanus
If cardiac output increases and resistance in arterioles does NOT change, what
happens to arterial blood pressure? - ANSWER: increases
The action potential traveling along the t-tubule changes the conformation of the -
ANSWER: dihydropyridine (DHP) receptor (L- type calcium channel)
Restoring lost fluid from the capillaries back to the circulatory system is one of the
major functions of the ________ system. - ANSWER: lymphatic
An increase in plasma potassium levels is properly called - ANSWER: hyperkalemia
Chief cells secrete - ANSWER: pepsinogen
The hormone vasopressin - ANSWER: stimulates kidneys to retain water
The enzyme renin is responsible for the production of - ANSWER: Angiotensin I
A glomerulus is - ANSWER: a "ball" of capillaries within Bowman's capsule
Dehydration leads to ________ blood volume, ________ blood pressure, and
________ osmolarity. - ANSWER: decreased, decreased, increased
G cells of the stomach secrete - ANSWER: gastrin
Increased angiotensin II levels would result in increased - ANSWER: a. blood volume
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