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ziro4ka [17]
3 years ago
15

The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______. The autorhythmicity of c

ardiac pacemaker cells is made possible by the reduced permeability of _______. magnesium sodium calcium potassium
Biology
1 answer:
vichka [17]3 years ago
7 0

Answer:

<h2>potassium</h2>

Explanation:

The heartbeats of the heart are controlled by the sinoatrial node also known as the pacemaker of the heart. The impulse is generated in the conducting cells of the pacemaker as a result of the movement of sodium, potassium and calcium ions.

The sodium channels allow the movement of sodium into the cell which depolarizes the membrane from -60mv to -40 mv. At this point, the calcium gated channels open which allow the entry of the calcium in the cell which depolarizes the cell up to +5mv.

At this point, the potassium channels open which allows the potassium ions to move out of the cell. This repolarizes the cell and hence the cycle again begins.  Reducing the permeability of the potassium ions help generate the autorhythmicity due to repolarization and thus is the correct answer.

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The correct answer is A.

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3 years ago
A student explains the formation of the planetary system as follows.
Galina-37 [17]
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3 years ago
What behavioral differences would you predict between the chicks treated with testosterone and chicks in each of the control gro
Troyanec [42]

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Throughout the clarification section below you can find a summary of the query.

Explanation:

Testosterone would be the masculinity compound or factor of the chick, compared to that same checking kids, behavioral improvements can be seen throughout testosterone-treated kids across two weeks.

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Vlada [557]

Answer:

True.

Explanation:

Earth rotation can be defined as the amount of time taken by planet earth to complete its spinning movement on its axis. This ultimately implies that, the rotation of earth refers to the time taken by earth to rotate once on its axis. One spinning movement of the earth on its axis takes approximately 24 hours to complete with respect to the sun.

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4 0
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