The phrenic nerves arise from the
A. cervical plexuses.
B. sacral plexuses.
C. brachial plexuses.
D. lumbar plexuses.
Answer: A
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Clusters of rough endoplasmic reticulum and free ribosomes are known as
A) neurofilaments. B) neurofibrils. C) synapses. D) Nissl bodies. E) microglia.
Which of the following is NOT correctly matched?
A. astigmatism: blurred vision due to an unequal curvature of the cornea or lens B. cataracts: cloudiness of the lens C. glaucoma: abnormally high intraocular pressure due to a buildup of aqueous humor from a blockage of the canal of Schlemm (scleral venous sinus) D. myopia: nearsightedness due to an abnormally long eyeball E. presbyopia: inability of the eyes to accommodate for distance vision due to a loss of elasticity in the lens
Which of the following is found in the posterior group of forearm muscles?
A. Flexor digitorum profundus B. Flexor digitorum superficialis C. Flexor carpi radialis D. Abductor pollicis longus E. Palmaris longus
Sally sustained damage to some autonomic ganglia. What part of the visceral reflex arc is interrupted?
A) initiation of a motor impulse in the central nervous system (CNS) B) integration C) motor response in a target cell D) sensory reception