During a contraction, muscles DO NOT _____.
a. shorten in length.
b. generate heat due to aerobic respiration.
c. all require involuntary control of muscle cells.
d. are first excited before the contraction can occur.
e. all of these
Answer: c. all require involuntary control of muscle cells.
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In vertebrates, the central nervous system (CNS) consists of the ____
a. brain and spinal cord b. brain and gray matter c. spinal cord and gray matter d. brain and reflexes e. spinal cord and nerves
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Why are some proteins more likely than others to diverge within a species?
What will be an ideal response?
Once the threshold is reached as a cell depolarizes
A) K+ channels open. B) Na+ channels close. C) an action potential is triggered. D) the interior of the cell becomes negative with respect to the outside.