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Which Of These Forces Move Each Ion (ca2+, K+, Na+) Across The Cell Membrane? 10 Pts Right Away?

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Which Of These Forces Move Each Ion (ca2+, K+, Na+) Across The Cell Membrane? 10 Pts Right Away?

Postby Obediah » Thu Mar 30, 2017 3:51 pm

What forces (EITHER concentration gradient, electrical difference, both?) tend to move each of these ions

Ca2+

K+

Na+

in a particular direction across the membrane when the appropriate membrane channels open?

**Be specific about the direction of movement (i.e. into the cell or out of the cell).

BE CONCISE, SHORT STR8 TO POINT 10 PTS RIGHT AWAY TO BEST ANSWER!!
Obediah
 
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Which Of These Forces Move Each Ion (ca2+, K+, Na+) Across The Cell Membrane? 10 Pts Right Away?

Postby Amwolf » Fri Mar 31, 2017 3:32 am

An influx of Na+ into the cell makes the cell more positive (or less negative). This influx of sodium creates a concentration gradient pulling K+ out of the cell. Na+ enters the cell at a rate of 3:2 in relation to K+ exit. This wave of depolarization causes Ca2+ channels to open. The concentration gradient is what pulls K+ out of the cell. The electrical difference or charge (depolarization of the surface membrane) is what causes Ca2+ release.

So the answer would be both.
Amwolf
 
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Joined: Sun Jan 19, 2014 10:08 pm


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