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The given paragraph describes the restin...

The given paragraph describes the resting state of a nerve fiber.
When a neuron is resting , the axonal membrane is comparatively.....P........to potassium ions `(K^+)` and .....Q.... to sodium ions `(Na^+)` Similarly, the membrane is .....R....to negatively charged proteins present in the axoplasm .contains high concentration of ........s....... and ......T........P, Q, R ,S and are respectively

A

More permeable , nearly impermeable impermeable , `K^(+)` , proteins

B

Less permeable , nearly impermeable impermeable , `K^(+)` , proteins

C

More permeable , nearly impermeable less permeable , `Na^(+)K^(+)`

D

less permeable , highly permeable impermeable , `K^(+),Ca_(2)^(+)`

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The correct Answer is:
A
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Assertion : When a neuron is not conducting any impulse, i.e. resting, the axoplasm inside the axon contains high concentration of K^(+) and negatively charged proteins and low concentration of Na^(+) . Reason : In resting, the axonal membrane is comparatively more permeable to K^(+) ions and nearly impermeable to Na^(+) ions. Similarly, the membrane is impermeable to negatively charged proteins present in axoplasm

Read the given statements and select the correct ones. (i)Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body. (ii)Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath. (iii)Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K^+) than to sodium ions (Na^+) (iv)A synapse is formed by the membranes of presynaptic neuron and a post synaptic neuron.

Mechanism of blood clotting is given below : An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation . An enzyme complex, …………P……… is formed by a series of linked enzyme reactions (...........Q.........Process) involving a number of factors present in the plasma in an inactive state. This enzyme complex is required for formation of ...............R............ ..........S........... ions play a very important role in clotting . Identify the correct option that represents P, Q, R , and S .

Read the given paragraph. In the resting state, the axonal membrane is ___ with more ___ charged ions outside than inside.This unequal distribution of ions is due to (1) the selective permeability of the membrane, which forms an almost impenetrable barrier to _____ and (2) the action of the ____, which pumps _____ Na^(+) out of the neuron for every ____ K^+ brought in. Select the option that correctly fills the blanks in the paragraph.

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