BIO 392 Exam 2 | Questions with 100% Correct Answers
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BIO 392
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BIO 392
BIO 392 Exam 2 | Questions with 100% Correct Answers An agonist on muscarinic receptors will have the following effect A. constriction of the respiratory tubes (bronchioles) B. dilation of the respiratory tubes (bronchioles) C. none of these answers are correct The postganglionic neuron releases...
An agonist on muscarinic receptors will have the following effect
A. constriction of the respiratory tubes (bronchioles)
B. dilation of the respiratory tubes (bronchioles)
C. none of these answers are correct
The postganglionic neuron releases ____ in the parasympathetic division, and _____ in
the sympathetic division
A. epinephrine; norepinephrine
B. norepinephrine; acetylcholine
C. acetylcholine; norepinephrine
D. acetylcholine; acetylcholine
Digestion is stimulated by the
A. suprachiasmatic nucleus
B. spinal cord
C. sympathetic neurons
D. vagus nerve
In the parasympathetic outflow, the ______ is longer than the _____
A. autonomic neuron; somatic motor neuron
B. somatic motor neuron; autonomic neuron
C. postganglionic neuron; preganglionic neuron
D. preganglionic neuron; postganglionic neuron
The sympathetic ganglia can be found ______ to the spinal cord
A. close to
B. far away from
Atropine (an antagonist on muscarinic receptors) will have the following effect
A. constriction of the respiratory tubes (bronchioles)
B. dilation of the respiratory tubes (bronchioles)
C. none of these answers are correct
,The sympathetic neurons leave from the ____ of the spinal cord
A. thoracic and lumbar region
B. cranial (brain) and sacral segments
Somatic motor neurons are mostly involved in
A. voluntary motions
B. involuntary actions
The relaxation of skeletal muscle relies on the activity of the ________, which
decreases cytoplasmic calcium
A. Ca2+ ATPase
B. dihydropyridine (DHP) receptor (L-type calcium channel)
C. ryanodine receptor
D. acetylcholine receptor
ATP _______ the myosin head
A. allosterically modulates
B. covalently modulates
C. hydrolyzes
D. does not bind to
During a contraction, which band(s)/zones becomes more narrow?
A. I band and H zone
B. H and A zones
C. I band only
D. A zone only
E. H zone only
Which of the following occurs when a myofibril contracts?
A. Thick filaments shorten, but thin filaments slide.
B. Thin filaments shorten, but thick filaments slide.
C. Thin and thick filaments slide past each other, but do not change in length.
D. Thin and thick filaments shorten as they slide past each other.
The site of calcium regulation in the skeletal muscle cell is ___ (hint: we're looking for
something to which calcium can bind)
A. myosin head
B. actin
,C. troponin and tropomyosin complex
D. calmodulin
The H zone contains
A. actin only.
B. thin filaments only.
C. thick filaments only.
D. thick and thin filaments
As ATP binds to the myosin head at the beginning of a muscle contraction cycle, the
myosin head immediately
A. initiates binding with actin.
B. tightens its bond to actin.
C. swivels, making the power stroke.
D. detaches from actin.
Each myosin head has a binding site for
A. ATP only.
B. actin only.
C. calcium and ATP.
D. actin and ATP.
The contraction cycle is triggered by the rise in ________ released from the
sarcoplasmic reticulum (SR).
A. Ca2+
B. K+
C. Na+
D. none of these answers are correct
In order for high-force cross bridges to form in contracting skeletal muscle, calcium must
A. phosphorylate the tropomyosin which moves it.
B. bind to troponin which moves the tropomyosin.
C. bind to tropomyosin which moves the troponin.
D. phosphorylate the troponin to move the tropomyosin.
E. bind to calmodulin to phosphorylate the myosin.
The hydrolysis of ATP causes myosin to immediately
A. bind strongly to actin
B. rotate into the cocked position to bind weakly to actin. This brings the myosin head in
the high energy conformation
, C. release from the actin.
D. bind more tightly to the actin (rigor).
After death, when metabolism stops, in which step of the contractile cycle must skeletal
muscles remain?
A. the rigor state
B. a weak binding state
C. the power stoke phase
D. It depends on what part of the contractile cycle they were in at the time of death.
Which autonomic division elicit a body-wide response (as opposed to a more localized
regulation of individual organs)
A. sympathetic pathway
B. parasympathetic pathway
Epinephrine will have the following physiological effect
A. constriction of the respiratory tubes (bronchioles)
B. increased peristaltic movements in the gut
C. pupil constriction
D. increased heart rate
An agonist on muscarinic receptors will have the following effect
A. decreased peristaltic movements in the gut
B. increased peristaltic movements in the gut
C. none of these answers are correct
On average, the resting membrane potential is -70 mV. What does the sign and
magnitude of this value tell you?
A. There is no electrical potential difference between the inside and the outside surfaces
of the plasma membrane.
B. The outside surface of the plasma membrane is much more negatively charged than
the inside surface.
C. The inside surface of the plasma membrane is much more negatively charged than
the outside surface.
D. The inside surface of the plasma membrane is much more positively charged than
the outside surface.
The membrane potential is defined as
A. the fact that the body has more anions than cations
B. electrical disequilibrium between the ICF and the ECF (ions are not distributed evenly
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