Degeneration of the neurons in which of the following structures leads to the muscle tremors associated with Parkinson disease?
A. Cerebral crus
B. Inferior colliculi
C. Substantia nigra
D. Pons
E. Tegmentum
Answer: C
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Which of the following chewing muscles attaches to the sphenoid bone?
A. Lateral pterygoid B. Temporalis C. Masseter D. Genioglossus E. Digastric
Which of the following events occurs in an erection?
A. Vasoconstriction of arteries leading to erectile tissue of penis B. Engorgement of erectile tissue of penis with blood C. Relaxation of internal sphincter of urinary bladder D. Dilation of venules leading from erectile tissue of penis E. Decrease of blood flow to the penis
A trochanter is a ________
A) structure supported on the neck B) large, irregularly-shaped projection C) rounded, articular projection D) narrow opening in bone
In the regulation of body temperature, which component serves as the control center?
A) Skeletal muscle B) Hypothalamus C) Sweat gland D) Spinal cord