MEDICAL PHYSIOLOGY

Detailed explanation-1: -The action potential is an explosion of electrical activity that is created by a depolarizing current. This means that some event (a stimulus) causes the resting potential to move toward 0 mV. When the depolarization reaches about-55 mV a neuron will fire an action potential.

Detailed explanation-2: -During the resting state, the membrane potential arises because the membrane is predominantly permeable to K+. An action potential begins at the axon hillock as a result of depolarisation. During depolarisation, voltage-gated sodium ion channels open due to an electrical stimulus.

Detailed explanation-3: -All living cells have resting membrane potentials. This statement is true. This resting membrane potential is caused by the difference in ion concentration between the inside and outside of the cell. However, only certain cells are able to produce an action potential, such as a neuron and a muscle cell.

Detailed explanation-4: -Answer and Explanation: All of the following statements about resting membrane potential are true, except that it is oriented so that the cell’s interior is positive with respect to the extracellular fluid. The cell’s cytoplasm is actually more negative than the extracellular fluid (ECF).