Neuromuscular Junction Steps

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by DestiniQuinones
Last updated 5 years ago

Discipline:
Science
Subject:
Human Anatomy

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Neuromuscular Junction Steps

Neuromuscular Juntion Steps

Myofibrils and Sarcomeres

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Muscle At Rest

Calcium ions change shape of the proteins so myosin can be interacted with the actin and the myosin then drags the actin strands towards each other so it can contract................................................................................................................................................................................................................................................................................................

1)protein strands are made of myofibrils and each of these are broken into segments called sarcomeresinside the sarcomeres there are two protein strands called myofilaments- one is called actin and the other is myosin which is thicker and has knobs that branch of the strand.

muscles are triggered by motor neurons and each sarcomere has a motor neuron located nearby. It setoffs neurotransmitters which in return sers off potential actions in the muscle cell. These neurons flow through folds of the membrane called T-Tubules. When the signal reaches the SR the SR's channels are opened wide releasing calcium ions. The ions then diffuse with the troponin and moves the tropomyosin out of the way. With the tropomyosin mived the charges of the ATP on the bulbs of the myosin are free to connect with the actins. The bulbs then pull the actins close together contracting the sacromere. To uncontract ATP attaches itself to the bulbs of the myosin diffusing the touch instantly. The SR then pumps all of the calcium ions back inside of it

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Muscle Contraction

Set of proteins keeps myosin and actin from touching one another: troponin and tropomyosin that act as insulation. While it's at rest it prepares sodium ions to be used when it's signaled to contract. These sodium ions come from a type of smooth endoplasmic reticulum called sarcoplasmic reticulum which is wrapped around each sarcomere and nourished with calcium pumps

Explanation for Dummies


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