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31.

ECF contains which of these in large amounts:

A.	Sodium chloride or bicarbonates	B.	Magnesium and potassium phosphates
C.	Both of these substances listed in (a) & (b)	D.	None of these

32.

In the resting stage the axolemma is:

A.	Poorly permeable to Na+	B.	Quite permeable to K+ and Cl-
C.	Impermeable to all these	D.	Both (a) & (b)

33.

In resting stage the axolemma is poorly permeable to Na+ but quite permeable to K+ and Cl- by:

A.	10-20 times	B.	20-30 times
C.	50-60 times	D.	50-100 times

34.

Concentration of Na+ and Cl- into ECF is:

A.	10 times more than in cytoplasm	B.	20 times more than in cytoplasm
C.	10-14 times more than in Cytoplasm	D.	40 times more than n cytoplasm

35.

Concentration of K+ in cytoplasm is about:

A.	10 time more than in ECF	B.	20 times more than in ECF
C.	30 times more than in ECF	D.	40 time more than in ECF

36.

To avoid the danger of osmotic equilibrium due to passive transport of Na+ and Cl- from into cytoplasm from ECF and that of K+ from cytoplasm into ECF, all the cells:

A.	Constantly expel Na+ into ECF and take K+ from cytoplasm against concentration gradient	B.	All cells do not expel Na+ into ECF and take K+ from cytoplasm
C.	All cells expel K+ into ECF and take Na+ from cytoplasm	D.	All cells expel Cl- into ECF and take HCO-3

37.

Sodium pump means:

A.	Expelling of Na+ into ECF and intake of K+ from cytoplasm against concentration gradient	B.	Expelling of K+ into ECF and intake of Na+ from cytoplasm
C.	Only expelling of Na+ into ECF	D.	Only intake of K+ into cytoplasm

38.

Sodium-potassium-pump operates with the help of which of these enzymes:

A.	Na+ - K+ ATPase	B.	Phosphatase
C.	Isomerase	D.	Hydrolase

39.

The negative charges over complex organic molecules are neutralized by:

A.	Potassium ions	B.	Sodium ions
C.	Chloride ions	D.	None of these

40.

Neutralization of negative charges over complex organic molecules by K+ ions is a necessary process:

A.	To protect the coagulation of cytoplasm which could occur due to electric potential established within the cytoplasm	B.	To protect dehydration of neurons
C.	To protect hydration of axoplasm of neuron	D.	To neutralize the surface charge over axon