Multiple Choice
Which of these statements correctly describes why you are able to repeatedly contract and relax your muscles of respiration, allowing you to breathe in and breathe out?
A) As soon as all the Ca2+ stored in the lateral sacs of the sarcoplasmic reticulum is used up, muscle relaxation occurs.
B) After the muscle cells become excited, acetylcholinesterase maintains the action of acetylcholine.
C) When there is no longer a local action potential in the muscle cell, Ca2+ is actively transported back into the lateral sacs of the sarcoplasmic reticulum.
D) ATP is not available soon after the contraction.
Correct Answer:
Verified
Correct Answer:
Verified
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