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Question
An extended period of time between the P wave and the QRS complex may indicate which of the following?
A. The signal is taking too long to get to the AV node.
B. The signal is traveling too quickly to the AV node.
C. Ventricular contraction is taking longer than usual.
D. Ventricular contraction is faster than usual.
E. The atria are not contracting.
Answer
This answer is hidden. It contains 19 characters.
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.
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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?
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B. Beta
C. Delta
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Which of the following structures does not contain CSF?
A. Dural sinus
B. Lateral ventricle
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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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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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B. Tegmentum in the midbrain
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D. Reticular formation
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The __________ function(s) in visual attention, such as to look and follow the flight of a butterfly.
A. inferior colliculi
B. superior colliculi
C. tegmentum
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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
E. To allow the brain to attain considerable size without being impaired by its own weight
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
C. Mesencephalon
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A. High altitude
B. Air pollution other than by carbon monoxide
C. Renal disease
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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%
B. 47% to 63%
C. 25% to 37%
D. 42% to 45%
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Lymphocytes secrete antibodies, coordinate action of other immune cells, and serve in immune memory.
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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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B. liver; kidneys
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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
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B. glucagon; raises
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A. adrenal medulla; epinephrine
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