The release of neurotransmitter from the axon terminal is controlled by:
A. voltage-gated sodium channels.
B. voltage-gated potassium channels.
C. voltage-gated calcium channels.
D. voltage-gated chloride channels.
C
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If more calories are consumed than burned, excess energy is stored as:
What will be an ideal response?
Spongy bone is indicated by
a. A. b. B. c. C. d. D. e. E.
Sponges, cnidarians, and flatworms lack a specialized gas exchange surface because
A) they are too large for a circulatory system to operate well. B) they live without need for oxygen. C) they do not produce carbon dioxide. D) countercurrent exchange mechanisms cannot function well in their living conditions. E) nearly all of their cells are in direct contact with the external environment.
A man is standing in line behind you, and you notice that he is coughing up bloody phlegm. He seems underweight and fatigued. Which of the following is the most likely diagnosis given the information in this chapter?
A) heart disease B) asthma C) tuberculosis D) a cold