Which of the following is NOT a cranial nerve that innervates the extrinsic eye muscles?
A. Oculomotor
B. Trochlear
C. Abducens
D. Trigeminal
Answer: D
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When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________
A) tracing out where the auricles connect B) locating the base C) noticing the thickness of the ventricle walls D) finding the papillary muscles
The "lub-dup" heart sounds are produced by:
A. the walls of the atria and ventricles slapping together during a contraction. B. the blood hitting the walls of the ventricles and arteries, respectively. C. the closing of the atrioventricular valves ("lub") and the closing of the semilunar valves ("dup"). D. the closing of the semilunar valves ("lub") and the closing of the atrioventricular valves ("dup").
In the absence of extracellular Ca++, an action potential in a motor neuron failed to initiate contraction of the innervated skeletal muscle because of:
A. inhibition of Ca++ influx into the innervated muscle B. inhibition of ACh binding to receptors on the muscle end plate C. stimulation of ACh degradation D. inhibition of ACh release from the motor neuron E. inhibition of Ca++ binding to troponin C in the innervated muscle
The external ear and larynx are made of fibrocartilage tissue.
Indicate whether the statement is true or false