Answer:
B is INCORRECT
Explanation:
Action potential in contractile cells can be divided into 3 phases
1. Rapid depolarization; caused by fast influx of sodium ions into the cells. Last a few milliseconds.
2. Plateau phase: This is a sustained positive membrane potential, after rapid depolarization, caused by a balance between calcium ion influx and slow potassium ion efflux.
3. Rapid repolarization: Eventually there's a closure of all other ion channels except the potassium ion channels causing rapid efflux of potassium ions, returning the membrane potential back to negative.
A refractory period usually occurs after undergoing an action potential. During this time no action potential can occur.
The cytoskeleton of a cell can be described as framework and anchor for organelles.
the answer is the first one A.) Chlorophyll is a chemical found in a chloroplast.
B. It's less dense. Ice floats<span> because it is about 9% less dense than liquid water.</span>
Light
Oxidation of inorganic molecules
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