The main class(es) of neurotransmitters involved in regulating mood in vertebrate animals is/are
A. the biogenic amines.
B. acetylcholine and amino acids.
C. amino acids.
D. acetylcholine.
E. gases such as nitric oxide and carbon monoxide.
Answer: A
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Action potential propagation is the fastest in ____
a. a myelinated axon with a small diameter b. an unmyelinated axon with a small diameter c. a myelinated axon with a large diameter d. an unmyelinated axon with a large diameter e. all myelinated axons regardless of diameter
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What will be an ideal response?
If a 10-mile-wide comet hit Earth, how would this likely affect the history of life?
A) Most species would become extinct, and the rest would remain more or less unchanged. B) A mass extinction would occur, followed by lots of evolutionary change among descendants of the survivors. C) A slow climate warming and drying would begin, decreasing the biological diversity on Earth. D) Continental drift would be reversed, and all the continents would slowly be pushed together again.