The tunica media consists of ________
A) endothelium and the subendothelial layer
B) collagen fibers surrounding the vessel exterior
C) smooth muscle and elastic fibers
Answer: C
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The respiratory system
a. obtains oxygen from and eliminates carbon dioxide to the internal environment. b. consists of the heart, blood vessels and lungs. c. plays an important role in maintaining the proper pH of the internal environment by adjusting the rate of removal of acid-forming carbon dioxide. d. both (a) and (c) above. e. all of these answers.
Neurotransmitters are released from the ________.
A. epineurium B. postsynaptic membrane C. Ca2+ channels D. presynaptic terminal E. synaptic cleft
The target tissue for melatonin is the __________________
A. gonads. B. anterior pituitary. C. posterior pituitary. D. liver. E. hypothalamus.
Hormones
a. are all of similar chemical composition. b. combine with specific receptors on the target cell's surface or inside the target cell. c. are secreted at a constant rate. d. are also known as paracrines e. all of these answers.