af the following is incorrect fiber? OAs action potentials propagate deep into m
ID: 3510802 • Letter: A
Question
af the following is incorrect fiber? OAs action potentials propagate deep into muscle fibers along T-tubules, they cause a conformational change in the DHPR. O The neurotransmitter released by a motor neuron onto the motor endplate at the neuromuscular unction is acetylcholine (ACh). O According to the sliding filament hypothesis, during muscle contraction, the l Band, H zone, and sarcomere all "shink," while the A band does not. O During relaxation, titin and other structural proteins (including those found in connective tissue) enable the sarcomeres to return to their resting lengths. O Rigor is characterized by the tight binding of myosin to actin in the presence of ATP.Explanation / Answer
As the action potential they propagate along the sarcolemma deep in to the muscle fibers along the T-tubules they cause conformational change in DHPR
SLIDING FILAMENT OF CONTRACTION:
width of I band and H band both shink,width of A band remains the same
Titin probably helps the sarcomere return to its resting length after a muscle has contracted or been stretched, may help prevent overextension of sarcomeres
In vertebrates, motor neurons release acetylcholine (ACh), a small molecule neurotransmitter, which diffuses across the synaptic cleft and binds tonicotinic acetylcholine receptors (nAChRs) on the cell membrane of the muscle fiber, also known as the sarcolemma.
Tight binding of myosin with actin Rigor state,
ATP binds myosin- causing the myosin head to release actin
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