The respiratory control center is located in the:
A. cerebral cortex
B. pons
C. medulla oblongata
D. cerebellum
ANS: B
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Cells that respond to signals are usually called
A) responders. B) junctions. C) targets. D) receivers. E) contacts.
Secretions from digestive organs include
a. enzymes b. bile c. mucus d. hormones e. all of the above
Luteinizing hormone (LH) binds to interstitial (Leydig) cells and
A. increases testosterone production by the interstitial cells. B. inhibits sustentacular cells. C. promotes sperm cell production by the interstitial cells. D. decreases testosterone production by the interstitial cells. E. stimulates GnRH levels to increase in the testes.
Venous return is increased by all of the following EXCEPT ________.
A. exhalation B. the skeletal muscle pump C. sympathetic stimulation of the veins D. hypertension