What physiological process occurs in the structure labeled "7"?
A. release of neurotransmitter
B. activity of acetylcholinesterase
C. release of protein and calcium ions into the muscle fiber
D. opening of sodium channels and subsequent influx of sodium
E. conduction of the action potential into the cell interior
Answer: E. conduction of the action potential into the cell interior
- Labelled 7 is the T tubules of skeletal muscle,
- They are found at the center of skeletal muscles and are the extension of sarcolemma
- They contains highly specialised protein structure known as ion channels which allows excitation countraction coupling by the transmission of nerve impulses travelling along the sarcolemma causes mucle contraction
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