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What initiates the depolarization of the membrane in muscle contraction?
Wiki User
∙ 12y ago
Muscles contract when they receive nerve signals from the brain, telling them to put filaments in action. The thin ones slide past the thick, shortening the sarcomere (this is a special part of the muscle).
Wiki User
∙ 9y ago
Wiki User
∙ 12y agovyhjThe acetylcholine or ACH is transmitted over the synaptic cleft. It binds with receptors on the sarcolemma, or the muscle cells membrane. This creates an action potential, causing the cells reticulum to release calcium. So in general, the sodium rushing into the cell causes the depolarization.
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Which pump is responsible for muscle contraction through depolarization of muscle cell membrane?
Ca2+
Is depolarization the same as contraction in the heart?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell.
What is the key intracellular event that stimulates muscle contraction?
Depolarization
What ions are important in muscle contraction and impulse conduction as an action potential reaches a synapse?
Sodium & Calcium.At the synapse, or the motor end plate, acetylcholine opens sodium channels causing sodium influx into the muscle fiber causing depolarization.This depolarization causes calcium released from the sarcoplasmic reticulum that initiates muscle contraction by activating sarcomeres.
How does the nerve impulse cause contraction of the muscle?
The nerve impulse causes the release of acetylcholine from the motor end plate. This causes the depolarization of the membrane of the adjacent muscle cell. Depolarization triggers the release of calcium ions from the sarcoplasmic reticulum inside the muscle cell. In the presence of ATP, the high calcium level causes the myosin heads to bend, dragging actin filaments towards the middle of the unit of contraction.
What ion initiates muscle contraction?
when you are working out and you are lifting a weight....
The combining of the neurotransmitter with the muscle membrane receptors causes the membrane to become permeable to sodium ions and blank of the membrane?
Depolarization
Binding of the neurotransmitters with muscle membrane receptors causes the membrane to become permeable to sodium resulting in the influx of sodium ions an what of the membrane?
depolarization
Each heart contraction begins in a small group of cardiac muscle cells called?
The sinoatrial node is the small group of cardiac muscles that initiates each heart contraction.
What is the process of excitation contraction coupling?
cross bridge formation "Excitation-contraction coupling" connects muscle fiber excitation to the muscle fiber contraction (cross bridge formation). During contraction, myosin heads form cross bridges many times-with each cross bridge generating a small amount of tension in the muscle fiber.
In cardiac muscle the fast depolarization phase of action potential is the result of?
increased membrane permeability to sodium ions
At the neuromuscular junction, the muscle contraction initiation event is?
binding of acetylcholine to membrane receptors on the sarcolemma
