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What ions are important in muscle contraction and impulse conduction as an action potential reaches a synapse?
Wiki User
∙ 11y ago
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.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoalkali metal ions
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What is the membrane of a nerve cell is comprised of?
Its main function is to propagate the action potential (the 'impulse') along the length of the axon.
In which direction does a nerve impulse usually move?
It's called the ACTION POTENTIAL, or, in the case of a myelinated axon, SALTATORY CONDUCTION.
What is the difference between impulse conduction and transmission?
Impulse conduction refers to passage of impulse within the same cell. Where as transmission as the name implies, is concerned about passage of impulses either chemical or electrical from one cell to another.
What is the importance of delay in the action potential in the AV node?
At the AV node, the impulse is delayed for about 0.1s, allowing the atria to respond and complete their contraction before the ventricles contract.
The depressant effect of alcohol does not interfere with the conduction of the electrical impulse of the heartbeat?
true
What is the membrane of a nerve cell is comprised of?
Its main function is to propagate the action potential (the 'impulse') along the length of the axon.
What is impulse conduction?
Party of nervous
In which direction does a nerve impulse usually move?
It's called the ACTION POTENTIAL, or, in the case of a myelinated axon, SALTATORY CONDUCTION.
What is the difference between impulse conduction and transmission?
Impulse conduction refers to passage of impulse within the same cell. Where as transmission as the name implies, is concerned about passage of impulses either chemical or electrical from one cell to another.
1 List the physiological events that occur between delivery of the stimulus and the start of the recorded response?
The speed of nerve impulse transmission changes as the body ages. In infants, the transmission speed is only about half that seen in adults. By age five, most people have attained the adult velocity. A gradual decline in conduction velocity begins as people reach their 20s, and continues for the remainder of life. Another factor that influences conduction velocity is the length of the nerve itself. An impulse that has to travel a longer distance will take longer. Some nerves are naturally longer than others. Measurement of nerve conduction takes into account the length of the target nerve. Some other factors are: · Initiation of action potential in nerve fibers; · Conduction of impulse; · Release of acetylcholine from the nerve terminals; · Binding of acetylcholine to receptors of the motor end plate; · Depolarization of the end plate; · Initiation of action potential in muscle fibers; · Muscle contraction.
What is the importance of delay in the action potential in the AV node?
At the AV node, the impulse is delayed for about 0.1s, allowing the atria to respond and complete their contraction before the ventricles contract.
Why is the term action potential used to describe a nerve impulse?
It is a difference in charge supplied by ion position. In resting potential the tendency is for the inside of the cell membrane to have a negative ionic charge, while the outside of the membrane has a positive charge. The change, back and forth in these two charge potentials is the conduction of charge down the neuron and is called the action potential.
What kind of neurons does impulse conduction occur in the fastest?
nig
What tissue type functions in impulse conduction?
Nervous tissue.
Is the velocity of a nerve impulse greater than electrical conduction's?
yes
What features of nerves improve impulse conduction velocity?
myelin sheaths
Is an action potential necessary for a nerve impulse to occur?
Yes, an action potential is needed for a nerve impulse to occur.
