When the neuron stimulates a muscle fiber, what molecule diffuses across the synaptic cleft?
A) calcium
B) acetylcholine
C) sodium
D) sodium and potassium
Ans: B) acetylcholine
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If a sperm carrying the "Y" chromosome fertilizes the ovum, the resulting offspring will be
A) haploid. B) Rh positive blood type. C) male. D) fraternal twins. E) female.
What do the genioglossus, hyoglossus, and styloglossus muscles have in common?
A) All act on the tongue. B) All names indicate the relative size of the muscle. C) Each acts synergistically to elevate the jaw. D) All names reflect direction of muscle fibers.
What components are primarily lost from the body with sweating and vomiting?
a. water, salt, and hydrogen ions b. water, acid, and magnesium c. water, iron, and glucose d. water, calcium, and bicarbonate ions e. water, glucose, and acid
The thickest, mechanically strongest part of the meninges is the
a. dura mater. b. arachnoid. c. pia mater.