Neural Communication Questions With Answers

Animals are known to receive hundreds of stimuli at the same time. Their survival is dependant on identifying and thereby responding appropriately to the stimuli received. In almost all the animals, the process of neural communication takes place in four phases. In any case( both external or internal), information must be received, transmitted to the CNS, integrated and transmitted to the corresponding glands or muscles to bring about corresponding action which is the actual response.

1. Neurons communicate with each other by sending electrical impulses known as

(a) membrane potentials

(b) neuromodulators

(c) neurotransmitters

(d) action potentials

Answer: (d)

2. If the stimulation of a cell is strong, the strength of the action potential that is produced would be:

(a) twice that produced by the weak stimulation

(b) stronger than that produced by weak stimulation

(c) no different to that produced by weak stimulation

(d) weaker than that produced by weak stimulation

Answer: (c)

3. The collective name for serotonin, noradrenaline and dopamine is

(a) Amines

(b) Hallucinogens

(c) Anxiolytics

(d) Neurotransmitters

Answer: (a)

4. What happens to the excess neurotransmitters produced by presynaptic neurons?

(a) is eliminated by substances contained within the cell body

(b) is removed and taken around the rest of the body

(c) all of it is taken up by postsynaptic neurons

(d) it is taken back into the presynaptic neuron

Answer: (d)

5. Acetylcholine is a neurotransmitter enabling communication between muscles and nerves. In case of an interruption in the interaction between acetylcholine and acetylcholine receptor sites on the muscles, this condition can occur

(a) Botulism

(b) Myasthenia gravis

(c) Mutiple sclerosis

(d) Both A and B

Answer: (b)

6. Dopamine is an important neurotransmitter. Which disorder results when neurons in the brain producing dopamine die?

(a) Seizure disorder

(b) Parkinson’s disease

(c) Multiple sclerosis

(d) Lou Gehrig’s disease

Answer: (b)

7. This is a genetic disease causing neurons in the brain to waste away and die

(a) Polio

(b) Encephalitis

(c) Multiple sclerosis

(d) Huntington’s disease

Answer: (d)

8. This is a common neurotransmitter

(a) Acetylcholine

(b) Serotonin

(c) GABA

(d) All of these

Answer: (d)

9. The cavity of diencephalon is known as

(a) fourth ventricle

(b) third ventricle

(c) second ventricle

(d) first ventricle

Answer: (b)

10. Unidirectional transmission of a nerve impulse through nerve fibre is because

(a) sodium pump starts to operate only at the cyton and then continues into the nerve fiber

(b) nerve fiber is insulated by a meduallary sheath

(c) neurotransmitters are released by dendrites and not by axon endings

(d) neurotransmitters are released by axon endings and not by dendrites

Answer: (d)

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