Organisation of the PNS

Q.

A cell body which contains a nucleus and cytoplasm is ____________.

1. neuron

2. blood

3. cartilage

4. tendon

Q. Afferent nerve fibres conduct nerve impulses from the sensory organs to the CNS. Hence, it is also known as sensory nerve fibre.

1. False
2. True

Q. The autonomic neural system is also known as the

1. visceral nervous system
2. involuntary nervous system
3. voluntary nervous system
4. both a and b are correct

Q. Choose the functions of sympathetic nervous system

1. Constricts bronchi and pupil of eye
2. Increase heart rate, relaxes bronchi
3. Decreased heart rate, increase peristalsis
4. Dilates blood vessels, stimulates salivary secretions

Q.

Which of the following is a part of the peripheral nervous system?

1. Sensory pathway

2. Autonomic nervous system

3. Somatic nervous system

4. A, B and C

Q. Efferent nerve fibres conduct nerve impulses from the CNS to the effector organs such as muscles and glands.

1. False
2. True

Q.

Describe the hostology of human alimentary canal.

Q. Cardiac activity could be moderated by the autonomous neural system. Tick the correct answer.

1. The parasympathetic system stimulates heart rate and stroke volume
2. The sympathetic system stimulates heart rate and stroke volume
3. The parasympathetic system decreases the heart rate but increase stroke volume
4. The parasympathetic system decreases the heart rate but increase stroke volume

Q. Give examples of heart rate increasing hormone.

Q. The autonomic nervous system is divided into the system which prepares the body for emergencies and the system, which relaxes the body.

1. somatic nervous
2. parasympathetic
3. sympathetic
4. peripheral

Q. why does shcwann cell doesnt form myelin sheath in non-myelinated nerve fibre?

Q. A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happens in his neurohormonal control system?

1. Hypothalamus activates the parasympathetic division of brain
2. Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex
3. Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla
4. Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse

Q.

Regarding the Assertion and Reason, choose the correct option:

Assertion [A] : Sympathetic and parasympathetic systems have opposing functions.

Reason [R] : The parasympathetic nervous system ‘prepares you’ for action, while the sympathetic system ‘calms you’ down after action.

1. Assertion [A] is true and reason [R] is false.

2. Reason [R] is true and assertion [A] is false.

3. Assertion [A] is true and reason [R] is true and is a correct explanation to [A].

4. Assertion [A] is true and reason [R] is true but is incorrect explanation to [A].