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Q: What ion is released from the sarcoplasm when depolarization occurs?
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What transports calcium out of the sarcoplasm?

Calcium is transported out of the sarcoplasm by means of special ion pumps.


What ion is released within the myocardial cell with the depolarization and acts on the contractile proteins causing the cell to contract?

myosin?


What ion channel enables depolarization?

hhhij


What ion is rapidly moving into the cell during the depolarization period of an action potential?

Sodium.A positive ion (cation) that enters the cell (influx) rapidly when the membrane threshold is reached and the voltage gated sodium channels open.This occurs during the rising phase of an action potential, i.e. membrane depolarization beyond the threshold for activation.


Is the concentration of calcium ion greater in the sarcoplasmic reticulum or sarcoplasm of a resting muscle?

The Ca2+ ion concentration of the sarcoplasmic reticulum will be greater in a resting muscle


What ion is responsible for depolarization of hair cells of the spiral organ?

k+


What change in membrane potential triggers an action potential?

An ion channel.


How does a neuron create a positive feedback loop?

through what can be seen as the domino effect. when depolarization opens sodium ion channel and that results to the opening of more sodium ion channels. this creates a positive feedback loop.


What is the chief positive intracellular ion in a resting neuron?

The chief positive intracellular ion in a resting neuron is a potassium ion. Just inside the cell of a resting neuron, the membrane is negative.


The formation of a positive ion?

occurs when an electron is removed from an atom


What ion flows into a nerve cell when an axon's membrane depolarizes?

During the depolarization phase, sodium ions enter the cell through the open ion-channels (Na+ influx).


What type of bonding occurs between the polyatomic ion and another ion?

Bonding is essentially electrostatic attraction between ions.