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Why are calcium ions necessary for skeletal muscle contractions?
calcium increases the action potential transmitted along the scarcolemma
What is the graded potential generated along the muscle cell membrane?
The graded potential generated along the muscle cell membrane is known as an action potential. This is an electrical signal that travels along the membrane of the muscle cell, leading to muscle contraction. It is initiated by the movement of ions across the membrane in response to a stimulus.
What is the sequence of electrical changes that occurs along the sacrolemma when a muscle fiber is stimulated?
action potential
What happens when acetycholine binds to its receptor in the sarcolemma and triggers?
When acetylcholine binds to its receptor in the sarcolemma of a muscle cell, it triggers an action potential to be generated along the muscle cell membrane. This action potential then spreads along the sarcolemma and eventually leads to muscle contraction by initiating the release of calcium ions from the sarcoplasmic reticulum.
An electrical impulse moving down an axon is called?
This is called action potential. Action potential is the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
What causes an action potential when it binds the motor end plate?
When the neurotransmitter acetylcholine binds to the motor end plate, it triggers the opening of sodium channels in the muscle cell membrane. This influx of sodium ions leads to depolarization of the cell, creating an action potential that propagates along the muscle fiber, ultimately leading to muscle contraction.
What transmission of the depolarization wave along the neurons membrane?
Action potential
What is the regeneration of action potential called?
The regeneration of action potential is called "propagation." It involves the transmission of the action potential along the length of the neuron's axon.
During the action potential?
During the action potential, there is a depolarization phase where the cell membrane potential becomes less negative, followed by repolarization where it returns to its resting state. This involves the influx of sodium ions and efflux of potassium ions through voltage-gated channels. The action potential is a brief electrical signal that travels along the membrane of a neuron or muscle cell.
What is depolarization of the sarcolemma?
Depolarization of the sarcolemma is the process where there is a change in the electrical charge across the cell membrane of a muscle cell. This change in charge helps to propagate an action potential along the cell membrane, initiating muscle contraction.
What is the first phase after a stimulus in a muscle contraction?
The first phase after a stimulus in a muscle contraction is excitation-contraction coupling. This involves the transmission of the action potential along the sarcolemma and the release of calcium ions from the sarcoplasmic reticulum.
What effect does depolarization have on the motor end plate once action potentials arrive at the synaptic end bulb?
Depolarization at the motor end plate upon arrival of action potentials triggers the release of neurotransmitter acetylcholine into the synaptic cleft. This acetylcholine then binds to receptors on the muscle cell membrane, initiating muscle contraction by depolarizing the muscle cell membrane and allowing the action potential to propagate along the muscle fiber.
