C. Dirty hands ,is the correct answer.
CORNEA of the eye remains same throughout our life span
1.A
2.B
3.C
4.A
5.B
6.C
7.B
8.D
9.C
10.A
Hope that that helps!!!!
At the onset of a muscle contraction, the presence of calcium triggers the opening of the Na-K channels in the membrane. Potassium is a calcium inhibitor, so as the potassium flows out of the cell, it eventually reduces the presence of calcium. This causes the closure of the Na-K channel (negative feedback mechanism). In a hypokalemic state, the lack of sufficient K doesn't inhibit the calcium channel, and in turn doesn't properly terminate the muscle contraction at the cellular level.
