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Once a muscle action potential is initiated by the SA node where does the impulse spread?
Wiki User
∙ 14y ago
It then spreads to both the right and left atria, then to the AV node, then down the bundle of His to the Purkinje fibers where it spreads to both the left and right ventricles.
Wiki User
∙ 14y ago
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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.
When the what reaches the end of the axon the neurotransmitter is released?
When the _____________reaches the ends of the axon the neurotransmitter is released and it diffuses to the muscle cell membrane to combine with receptors there?Sarcolemma
When an action potential is initiated on a nerve cell membrane it radiates and is propagated in all directions from the point of initial stimulation?
Correct. The action potential is initiated at a specific point on the cell membrane called the axon hillock, and it then travels down the axon in one direction. Once initiated, it spreads along the entire length of the axon and can be transmitted to other neurons or muscle cells.
What is the duration of action potential of skeletal muscle?
Action potential duration in skeletal muscle is around 2 - 5 milliseconds.
What event occurs as a result of a muscle action potential?
Reflex action
Triggering of the muscle action potential occurs after?
Triggering of the muscle action potential occurs after acetylcholine binds to chemically-gated channels in the end plate membrane.
Steps in impulse transmission?
Brain send the message via nerve impulses involving neurons which use the neuro-transmitter AcetylcholineEach nerve impulse begins in the dendrites of a neuron's. the impulse move rapidly toward the neuron's cell body and then down the axon until it reaches the axon tip.a nerve impulse travels along the neuron in the form of electrical and chemical signals.Acetylcholine- a neurotransmitter released at the neuromuscular junction triggers a muscleaction potential, which leads to muscle contraction
What do muscles need so they can contract?
i know that you need a nerve impulse the second i think is calcium and i don't know what the third is. Movement is initiated by muscles (forces) moving about levers (bones, etc humerus) about axes (our joints). In order for a muscle to contract a neural impulse in needed and in the abssence of a neural impulse calcium is reabsorbed into the; sarcoplasmic reticulum ( part of a single muscle fibre)
What is the name for the impulse generated when a neuron fires?
Brain send the message via nerve impulses involving neurons which use the neuro-transmitter AcetylcholineAcetylcholine- a neurotransmitter released at the neuromuscular junction triggers a muscle action potential, which leads to muscle contraction
Why is the cardiac action potential longer?
The reason why cardiac muscle has a longer action potential is to extend the absolute refractory period to prevent another action potential. If too many action potentials stimulate the cardiac muscle it can get into tetanus which keeps the heart continuously contracted without relaxation.
Macroscopic neurology - trace impulse macroscopically through the nerveous system from the brain to the muscle?
Brain send the message via nerve impulses involving neurons which use the neuro-transmitter AcetylcholineEach nerve impulse begins in the dendrites of a neuron's. the impulse move rapidly toward the neuron's cell body and then down the axon until it reaches the axon tip.a nerve impulse travels along the neuron in the form of electrical and chemical signals.Acetylcholine- a neurotransmitter released at the neuromuscular junction triggers a muscle action potential, which leads to muscle contraction
Electrical excitation of muscle fiber?
Electrical excitation of a muscle fiber. Skeletal muscle fibers (cells) can be stimulated either by amotor neuron in the body or by a voltage stimulator in the lab. Stimulation given by either method results in a depolarization of the sarcolemma. If the depolarization reaches threshold, an action potential (electrical signal) is initiated.
