Biology - Mock Test 85

Question 841

During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q ?

A) P = Acetylcholine, Q = Ca++ B) P = Acetylcholine, Q = Na+ C) P = GABA, Q=Na+ D) P = Cholinesterase, Q = Ca++

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Question 842

Which neuroglia cells produce a fatty insulating material called myelin?

A) Satellite cells B) Schwann cells C) Both A and B D) Neither A nor B

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Question 843

Which one of the followings is the largest portion of the brain in humans?

A) Cerebrum B) Cerebellum C) Medulla D) Pons

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Question 844

Select the correct statement from the ones given below ?

A) Cocaine is given to patients after surgery as it stimulates recovery B) Barbiturates when given to criminals make them tell the truth C) Morphine is often given to persons who have undergone surgery as a pain killer D) Chewing tobacco lowers blood pressure and heart rate

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Question 845

When sympathetic nervous system is activated it causes the secretion of ?

A) Adrenaline which inhibits the organ B) Acetylcholine which stimulates the organ C) Adrenaline which stimulates the organ D) Acetylcholine which inhibits the organ

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Question 846

When a neuron is in resting state i.e. not conducting any impulse, the axonal membrane is ?

A) Comparatively more permeable to K+ ions and nearly impermeable to Na+ ions B) Comparatively more permeable to Na+ ions and nearly impermeable to K+ ions C) Equally permeable to both Na+ and K+ ions D) Impermeable to both Na+ and K+ ions

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Question 847

The thin and convoluted outer layer of gray matter that covers the cerebral hemispheres is ?

A) Medulla oblongata B) Thalamus C) Cerebral cortex D) Meninges

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Question 848

The protein carrier in the membrane, called "sodium-potassium pump" pumps ______ ?

A) Both Na+ and K+ in B) Both Na+ and K+ out C) Na+ in and K+ out D) Na+ out and K+ in

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Question 849

The generation of excitation-contraction coupling involves all the following events except ?

A) Generation of end-plate potential B) Release of calcium from troponin C) Formation of cross-linkages between actin and myosin D) Hydrolysis of ATP to ADP

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Question 850

The difference in voltage between the inside and outside of a cell is called ______ ?

A) Spike potential B) Action potential C) Resting potential D) Reaction potential

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