A build-up of K+ in the T-tubules can occur during periods of frequent muscle cell potentials. What will be the result?
A. Inhibition of muscle cell depolarization and contraction
B. Inhibition of neurotransmitter release from the motor neuron
C. Inhibition of relaxation, muscle stays in contracted state
D. None of the answer choices are correct
Answer: C
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Fill in the blank(s) with the appropriate word(s).
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What will be an ideal response?
__________ are chemical messengers secreted in the bloodstream and stimulate physiological responses in distant organs.
Fill in the blank(s) with the appropriate word(s).