I'm not for sure about it But i'm pretty sure it's D. Sorry if I'm wrong..
I got you
Answer- proteins
The plateau portion of the action potential in contractile cardiac muscle cells is due to the <u>membrane potential remaining almost constant</u>.
As the membrane gradually repolarizes This will be brought on by the nearly equal movement of charge into as well as outside of the cell.
As a result of this activity, the action potential reaches a plateau because a significant amount of calcium and sodium ions are transported through these channels towards the interior of such cardiac muscle fiber.
To learn more about cardiac muscle, here
brainly.com/question/15000912
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The correct answer is A the rods in our eyes are sensitive to the exact wavelengths of the light
