A spermatozoon has four parts: a head capped with an acrosome, an upper piece, a lower piece, and a tail
a. True
b. False
Indicate whether the statement is true or false
False
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Where are neuronal pools located?
A) within nerves B) within the CNS C) within ganglia D) within the PNS
Which two hormones promote the release of bile and pancreatic juice into the small intestine?
A) secretin; cholecystokinin (CCK) B) gastric inhibitory peptide (GIP); histamine C) somatostatin; secretin D) gastrin; histamine
Target cells make more receptors for a particular hormone when the level of that hormone declines in the blood stream. This process is known as:
A) upregulation. B) the second-messenger system. C) synergism. D) downregulation.
In males, the urethra is part of both the urinary system and ________
A) endocrine system B) digestive system C) immune system D) respiratory system E) reproductive system