PNS

Question 1

What is PNS?

Answer 1

Peripheral Nervous System- Consist of nervous tissue OUTSIDE the CNS.

Question 2

How are the 43 pairs of nerves in the PNS split?

Answer 2

1. 12 pairs of cranial nerves:
   • Made up of sensory nerves or motor nerves or mixed nerves made of both.
   • Leave the brain and conduct impulses to and from the sense organs and muscles in the head and face
2. 31 pairs of spinal nerves:
   • They are ALL MIXED nerves being made up of the FIBRES of the sensory and motor neurons.

Question 3

What are the functions of the PNS? (2)

Answer 3

◉ Sensory function: COLLECTS info FROM receptors and TRANSMITS it by way of impulses along sensory neurons TO the CNS.

◉ Motor function: TRANSMITS impulses FROM the CNS by way of motor neurons TO effectors to bring about an appropriate response.

Question 4

How is the motor division made up? (2)

Answer 4

1. Somatic nervous system: Conducts IMPULSES from CNS to Skeletal muscles ∴ it controls all VOLUNTARY MUSCULAR MOVEMENTS.
2. Autonomic nervous system: Conducts IMPULSES from the CNS to Cardiac muscle, smooth muscles and glands ∴ it controls functioning of INVOLUNTARY MUSCLES and GLANDS.

Question 5

What is ANS made up of (2)

Question 6

Functions of what ANS is made up of (2)