Question

58. Choose the false statement:

A. Contraction is initiated when acetylcholine is released onto the motor end plate; this stimulus event generates a twitch of limited duration due to the inactivating action of acetylcholinesterase in the synaptic cleft.

B. The transverse tubule system is an extension of the plasma membrane that serves to carry the action potential deep into each muscle cell’s cytoplasm; this ensures that all myofibrils within the cell will contract uniformly.

C. During muscle contraction, both the I-band and A-band get smaller and/or disappear, whereas the zone of overlap increases.

Answer 1