When calcium ion binds to troponin,
myosin shortens.
tropomyosin moves into the groove between the helical actin strands.
muscle relaxation occurs.
active sites on the myosin are exposed.
actin heads will bind to myosin.
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In rigor mortis
muscles are inextensible.
the myosin heads are attached to actin.
cross-bridge cycling is absent.
ATP is depleted.
All of the answers are correct.
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After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as
oxygen debt.
rigor mortis.
tetany.
depolarization.
treppe.
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The narrow space between the synaptic terminal and the muscle fiber is the
motor unit.
motor end plate.
synaptic knob.
synaptic cleft.
M line.
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