the process of contraction and relation in the muscles of oesophagus is called____
Answers
Answer:
An action potential in a motor neuron causes acetylcholine to release in the synaptic cleft.Acetylcholine binds with receptors on the cell membrane on the muscle fiber, opening Ca2+ -Na+ channels. Usually referred to as Calcium channels.
Calcium is released from the terminal cisternae into the muscle fiber.
Calcium binds to troponinTroponin shifts tropomyosin, which was blocking the active site on the actin.
Myosin heads attach to actin by breaking down ATP to ADP and a phosphate via Myosin-ATPaseThe Myosin head forms a ‘cross-bridge’ on the active site of the actin filament.
The cross bridge pulls actin, which slides over the myosin – known as the ‘Power Stroke.’
The release of ADP completes the cross-bridge movement and ATP attaches to myosin, breaking the actin-myosin crossbridge.
Every time ATP is split into ADP + P, the myosin head ‘cocks’ into place to form another cross bridge with actin.
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Peristalsis
The process of contraction and relation in the muscles of oesophagus is called peristalsis .
•Wave-like contractions of muscles helps in the digestion of food (solid food particles).
•Carries food to the stomach.
•Peristalsis is an involuntary movement
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