QUESTION 1 What are the two functions that proteins perform in the neuronal memb

Question

QUESTION 1 What are the two functions that proteins perform in the neuronal membrane to establish and maintain the resting membrane potential? o A. Provide channels to control movement of specific ions across the neuronal membrane O B. Pump ions across the membrane against their concentration gradient to maintain the resting membrane potential ° C. Insulate the axon to allow for faster conductance of the action potential 0 D. A and B OE, B and C QUESTION 2 Which ions carry the late outward currents during the action potential to repolarize the membrane? A. Sodium, Na+ O B. Potassium, K+ ° C. Calcium, Ca2+ OD. Chloride, CI QUESTION 3 The action potential is a 'wave of depolarization' that moves through what dimension? O A. space time both space and time

Explanation / Answer

Answer1 option D-( both A and B)

They pump ions across the membrane against their concentration gradient to maintain the resting membrane potential and they provide channels to control movement of specific ion across the neuronal membrane.

Answer2 option B - potassium, K +

During early repolarisation, potassium channels open and a brief efflux of potassium repolarises the cell slightly. During plateau phase, calcium channels open whereby calcium flows into the cell. The influx of calcium is steady and give rise to the plateau phase. At repolarisation phase, calcium channels close and potassium channels open again and the efflux of potassium repolarises the cell.

Answer3- option C

Movement of electrically charged particles- which occur during spread of the cardiac - potential generates an electrical vector. A vector is a quantity that has both magnitude and direction in space. The depolarisation propagates through the myocardium similar to the spread of a wave front in a water. At any given instant in time there are numerous small depolarising wave fronts that propagate through the myocardium.

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