Which of the following describes an event that occurs in the latent phase of a muscle contraction?
A. Calcium is actively transported back to the sarcoplasmic reticulum and the muscle produces acetylcholinesterase to remove the acetylcholine from the receptors.
B. The muscle cell shortens.
C. Acetylcholine is released and fits into the receptors on the muscle cell.
D. The muscle goes back to shape because it is elastic.
Answer: C
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Describe the structures and functions of the enteric nervous system
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The ion that plays a key role in initiating electrical signals in neurons is
A) Ca2+. B) Cl-. C) K+. D) Na+.
Proteins do not pass through plasma membranes because
A. they are very large molecules. B. the membrane is made of protein. C. they cause emulsification. D. they contain nitrogen.