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Question
What happens when acetylcholine stimulates its receptors in the neuromuscular junction?
A. The release of Ca2+ from the sarcoplasmic reticulum decreases.
B. The permeability of the sarcolemma to Na+ increases.
C. The positive charge on the sarcolemma decreases.
D. The threshold of the muscle fiber lowers.
E. The inhibitory effect of acetylcholinesterase is overridden.
Answer
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Related questions
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The sympathetic chain of ganglia is found at the __________ levels of the spinal cord.
A. cervical and thoracic
B. thoracic and lumbar
C. thoracic, lumbar and sacral
D. sacral, lumbar and coccygeal
E. cervical, thoracic, lumbar, sacral, and coccygeal
Q:
Sympathetic nerve fibers are not associated with situations involving __________.
A. anger
B. digestion
C. exercise
D. stress
E. arousal
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Which of the following statements is true regarding parasympathetic tone?
A. It holds the resting heart rate below its intrinsic rate.
B. It accelerates the resting heart rate above its intrinsic rate.
C. It might increase or decrease heart rate depending on the situation.
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Which of the following cranial nerves is mispaired?
A. Abducens - V
B. Oculomotor - III
C. Facial - VII
D. Accessory - XI
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Exhausted from studying all night, you briefly close your eyes and your mind starts to wander. Which brain waves would be most predominant in an EEG?
A. Alpha
B. Beta
C. Delta
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Which of the following structures does not contain CSF?
A. Dural sinus
B. Lateral ventricle
C. Central canal
D. Subarachnoid space
Q:
The pyramidal cells of the precentral gyrus are called __________ neurons.
A. stellate
B. third-order
C. first-order
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E. lower motor
Q:
Which of the following is correct regarding the occipital lobe?
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B. It is the principal visual center of the brain.
C. It is the primary site for receiving and interpreting signals from the general senses.
D. It is concerned with voluntary motor functions.
E. It is likely to play a role in understanding spoken language.
Q:
Planning, motivation, and social judgment are functions of the brain associated with which part of the cerebrum?
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C. Occipital lobe
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Q:
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A. Left cerebral hemisphere
B. Tegmentum in the midbrain
C. Cerebellum
D. Reticular formation
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Q:
The __________ function(s) in visual attention, such as to look and follow the flight of a butterfly.
A. inferior colliculi
B. superior colliculi
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Which of the following is not a function of CSF?
A. To regulate the chemical environment of the nervous tissue
B. To rinse metabolic wastes from the nervous tissue
C. To provide oxygen and nutrients to the nervous tissue
D. To protect the brain from striking the cranium when the head is jolted
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Q:
From superficial to deep, the meninges occur in which order?
A. Dura mater, pia mater, arachnoid
B. Dura mater, arachnoid, pia mater
C. Pia mater, dura mater, arachnoid
D. Pia mater, arachnoid, dura mater
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Q:
Which of the following structures appears as a large bulge just rostral to the medulla?
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B. Diencephalon
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A. High altitude
B. Air pollution other than by carbon monoxide
C. Renal disease
D. Smoking
E. Any factor that creates a state of hypoxemia
Q:
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B. A diet predominantly based on red meat
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A normal hematocrit is __________ of the total blood volume.
A. less than 1%
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C. 25% to 37%
D. 42% to 45%
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A person develops anti-A antibodies only after he is exposed to antigen A, and anti-B antibodies only after he is exposed to antigen B.
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C. action of phospholipase A2
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A. arachidonic acid
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A. adrenal glands; intestines
B. liver; kidneys
C. blood; kidneys
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Q:
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A. Negative feedback inhibition
B. The antagonistic effect
C. Up-regulation
D. Enzyme amplification
E. Down-regulation
Q:
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A. G protein activates adenylate cyclase
B. cAMP activates protein kinases
C. Adenylate cyclase produces cAMP
D. G protein is activated by the binding of a hormone to the receptor
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Q:
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C. Gastrin
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Q:
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E. glucocorticoids; raises
Q:
. The __________ secrete(s) __________, which promotes Na+ and water retention.
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