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Exam_1_Answers_rev..pdf.pdf-BIO 3200 NAME (print):_______________________ EXAM I
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Exam_1_Answers_rev..pdf.pdf-BIO 3200 NAME (print):_______________________ EXAM I
Page 6
BIO 3200 EXAM I Answers
September 24, 2019
5
A26, B16, C5.
Which of the following travels from its point of secretion to its target through the
hypothalamic-hypophyseal portal system?
a)
oxytocin
b)
ACTH
c)
cortisol
d)
GnRH
e)
acetylcholine
A27, B36, C18.
Which of the following is not true of intracellular Ca
2+
?
a)
It may increase because of Ca
2+
influx through voltage-gated Ca
2+
channels
b)
It may increase because of Ca
2+
release from endoplasmic reticulum
c)
It may trigger release of neurotransmitter by exocytosis
d)
It may bind to and activate calmodulin
e)
Its concentration is higher than extracellular Ca
2+
A28, B24, C32.
Which is not true of the adrenal cortex?
a)
it releases cortisol and aldosterone
b)
it is stimulated by ACTH
c)
it is the outer part of the adrenal gland
d)
it is hypoactive in Addison’s disease
e)
its hormones are stored in secretory vesicles and released by exocytosis
A29, B29, C16.
Norepinephrine acts on the heart to increase heart rate.
Acetylcholine acts to
slow down heart rate.
This is an example of
a)
Tonic control
b)
Autocrine control
c)
Agonistic control
d)
Lateral inhibition
e)
Antagonistic control
A30, B38, C41.
Which is not a function of the hypothalamus?
a)
it controls endocrine signaling through the pituitary
b)
it interacts with the limbic system to influence behavior and emotions
c)
it maintains homeostasis including body temperature
d) it controls food intake
e) it controls the general level of motor activity (movement)
A31, B39, C42.
LH is
a)
released from the anterior pituitary in response to GnRH
b)
released from nerve endings in the posterior pituitary
c)
released from the hypothalamus to stimulate release of FSH
d)
released from the hypothalamus to stimulate release of GnRH
e)
released from the anterior pituitary to stimulate release of FSH


Page 7
BIO 3200 EXAM I Answers
September 24, 2019
6
A32, B42, C12.
Conduction velocity along a nerve axon is faster if
a)
the axon is myelinated
b)
the axon has a larger diameter
c)
the axon has a smaller diameter
d)
both a and b
e)
both a and c
A33, B35, C43.
Which structure in Figure 2 relays sensory information to the appropriate
sensory cortex?
B
A34, B22, C15.
Unlike action potentials, graded potentials cannot be used for long-distance
signaling because
a)
graded potentials are limited to the cell body of a neuron
b)
graded potentials show spatial summation so they cannot transmit individual signals
c)
graded potentials dissipate with distance from the point of stimulation
d)
graded potentials do not travel fast enough
e)
graded potentials are only inhibitory
A35, B27, C46.
Nicotine binds to and mimics the effect of acetylcholine on the nicotinic
acetylcholine receptor.
Nicotine is
a)
an antagonist of that receptor
b)
a second messenger of that receptor
c)
a prohormone of that receptor
d)
an agonist of that receptor
e)
a transducer of that receptor
A36, B18, C27.
In the central nervous system, myelin is formed by
a)
microglia
b)
neurons
c)
astrocytes
d)
Schwann cells
e)
oligodendrocytes
A37, B15, C2.
D-tubocurarine (curare) is a reversible inhibitor of the nicotinic acetylcholine
receptor.
A good treatment for curare poisoning would be
a)
pyridostigmine, an acetylcholinesterase inhibitor
b)
fluoxetine, a serotonin-specific reuptake inhibitor
c)
tetrodotoxin, a Na
+
channel blocker
d)
the neurotransmitter GABA
e)
verapamil, a Ca
2+
channel blocker


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