PNS

Q.

What are nerves? What are their functions?

Q.

What is the longest cranial nerve?

Q.

Write the effects of sympathetic system on heartbeat, urinary bladder and absorption of food.

Q.

An example of autonomous nervous system is

1. swallowing of food

2. pupillary reflex

3. peristalsis of intestine

4. knee-jerk response

Q. Which of the following statement(s) is/are true?
1. Somatic neural system transmit impulses from CNS to skeletal muscles.
2. Autonomic neural system transmits impulses from CNS to involuntary organs and smooth muscles.
3. Unmyelinated nerve fibres are found in spinal and cranial nerves
4. Myelinated nerve fibres are found in autonomous and the somatic neural systems.

1. 1 and 2 only
2. 1 and 3 only
3. 3 and 4 only
4. 1, 2 and 4 only

Q.

Identify the incorrect statement(s) regarding the components of PNS.

I. The nerves carrying impulses from CNS to peripheral system are sensory nerves or afferent nerves

II. The nerves carrying impulses from peripheral system to CNS are motor nerves or efferent nerves

III. Afferent nerves bring in impulses from the auditory, visual and touch receptors.

IV. Efferent nerves coordinates impulses towards effector organs.

1. I and II

2. III and IV

3. I and III

4. II and IV

Q.

List three types of nerves present in the body.

Q. Assertion: Effect of sympathetic nervous system is excitatory in order to meet an emergency.
Reason: Sympathetic nervous system is a division of the autonomic nervous system.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
3. Assertion is true but the reason is false
4. Reason is true but the assertion is false