CARDIOVASCULAR SYSTEM
1. Which of the following is part of the reflex response to an increase in arterial
pressure? a) Decreased firing of carotid sinus baroreceptors
b) Increased sympathetic activity to the ventricles
Increased parasympathetic activity to the SA Node c)
d) Increased parasympathetic activity to the arterioles of skeletal muscles & skin
e) Increased parasympathetic stimulation to the ventricles
2. Correct sequences of steps in short-term compensation for hemorrhage
include:
a) Decreased arterial pressure Increased baroreceptor firing rate
b) Increased formation of Angiotensin II Increased renin released by kidneys
c) Decreased excretion of Na+ and water Increased aldosterone formation
Increased sympathetic activity Decreased firing of baroreceptors d)
e) Decreased atrial volume Increased volume receptor firing rate
3. Venous Return: a) Is increased on standing
b) Decreases by deep inspiration
c) Is decreased by venoconstriction
ivates Bainbridge reflexWhen increased, act d)
e) When increased, increases end-systolic volume
4. The nerve supply to the heart is as follows:
a) SA Node is innervated by sympathetic only
parasympathetic Atrial muscle is innervated by both sympathetic & b)
c) Right vagus supplies SA node & AV node
d) Left vagus supplies SA node
e) Parasympathetic supplies ventricular muscle
5. Which of the following is not a characteristic of cardiac muscle?
a) It's a syncytium of muscle fibers
b) There are intercalated discs
c) Gap junctions cause spread of depolarization
Has myosin and actin muscles d)
e) There are paracellular spaces
6. The pacemaker prepotential: a) Is due to a slow decrease in K+ influx
b) Is a slow increase in Resting Membrane Potential
c) Maintained by opening of long acting Ca2+ channels d) Is augmented by opening of transient Ca2+ channels
Occurs only in the SA node e)
