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SCS2159 - Muscular-Cardiovascular Exam Study Guide
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SCS2159 - Muscular-Cardiovascular ExamStudy Guide
Identify the ONE CORRECT statement regarding the skeletal neuromuscular junction.
a) At the terminal bouton, voltage-gated Ca++ channels open to allow efflux of Ca++ that
triggers acetylcholine release
b) All neuromuscular junction synapses are excitatory - Answer b) All neuromuscular
junction synapses are excitator
True or False: Parasympathetic activation produces a more diffuse effect compared to
activation of the sympathetic nervous system - Answer False
A young boy darts into the path of a car after attending a Baltimore Orioles-Boston Red
Sox baseball game with his father. In the accident the child suffered a broken thigh,
broken shoulder blade and broken ribs. He also lost 30% of his blood during the
accident. On arriving at the hospital, a number of tests were conducted on the lad. His
hematocrit would have:
a) Decreased
b) Stayed the same as before the accident - Answer b) Stayed the same as before the
accident
How would you increase flow to the body without increasing aortic radius?
i) increase cardiac muscle contractility
ii) decrease pulmonary vein radius
iii) decrease total peripheral resistance
iv) increase total peripheral resistance
v) increase venous return
a) i.ii
b) i.ii.iii
c) i. iii. v
d) ii. iii. v - Answer c) i. iii. v
Why can extra-systoles occur after multiple stimulations?
a) The cardiac muscle summates
, b) A stimulation occurs after the absolute refractory period has ended - Answer b) A
stimulation occurs after the absolute refractory period has ended
You are conducting an experiment with a frogs heart. You administer three cholinergic
drugs to the heart - waiting 5 min in between each treatment. WITHOUT washing the
drugs off between administrations, explain what the effects on heart rate (HR) will be
after: acetylcholine, atropine, pilocarpine. - Answer AcH - decreases HR
atropine - increases HR
pilocarpine - decreases HR
A decrease in afterload will lead to...? - Answer Increased stroke volume
True or False: a decrease in parasympathetic activity and an increase in sympathetic
activity will decrease heart rate - Answer False
As mean arterial pressure increases, the ________, informing the medulla oblongata that
blood pressure has indeed increased. - Answer Frequency of action potentials from the
baroreceptors increase
Conduction through which of the following is slow to allow atria to contract before the
ventricles?
a) SA node
b) AV node - Answer b) AV node
Fenestrated capillaries are unique in their ability to ________.
a) Allow few molecules to pass between endothelial cells
b) Allow relatively large molecules to pass between endothelial cells - Answer b) Allow
relatively large molecules to pass between endothelial cells
In response to a decrease in tissue metabolic activity, tissue oxygen concentrations
________, which causes a(n) ________.
a) Increase : constriction of the arterioles
b) Decrease: constriction of arterioles
c) Increase: dilation of arterioles
d) Decrease: dilation of venules - Answer a) Increase : constriction of the arterioles
Mean arterial pressure can be increased by all of the following except ________.
a) Increasing EDV
b) Decreasing EDV - Answer b) Decreasing EDV
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