Chapter2: Roles and Different sub-divisions of CNS PNS

Question 1

The Central Nervous System

Answer 1

Comprises of the brain and its extension to the spinal cord

Question 2

Role of CNS

Answer 2

Process Info received from the body’s internal and external environments to activate appropriate responses.

Question 3

CNS: Brain

Answer 3

Intricate of a network of cells that plays a vital role in processing info received through the nerve pathways from the body and directing actions within the body.

-Receives and analyses sensory info, responds by controlling all bodily functions and actions

Question 4

Spinal cord

Answer 4

Long thin bundle of nerve tissue connecting to the brain and the rest of body via PNS.

Question 5

Function of Spinal cord

Answer 5

-receive sensory info from the body via PNS and send messages to the brain for processing. e.g itch
-Receive motor info form the bain and send it to relevant parts of the body via PNS, controls muscles, glands and internal glands so appreciate action is taken.

Question 6

Peripheral NS

Answer 6

is the entire network of cells located outside the CNS. Extends form the body to the fingers and throughout the skin.

Question 7

Role of PNS

Answer 7

-Carries info to the CNS from the body’s muscles, organs and glands.
-Carries info from CNS to the body muscles, organs and glands

Question 8

PNS Subdidvion: Somatic NS

Question 9

Part of Somatic NS

Answer 9

Afferent: Sensory info coming into the CNS

Efferent: Motor info leaving CNS

Question 10

PNS Subdidvion: Automatic NS

Answer 10

Connects to the CNS to the body’s internal organs, and glands, providing feedback to the brain about their activities.

-Self-regulating, become aware of it when you feel emotions of anger, or fear.

Question 11

Sub Division of Automatic Nervous System

Answer 11

Sympathetic NS: responsible for increasing activity of visceral muscles, organs and glands in vigours activity, stress or threats.

Parasympathetic NS: Decreasing activity of visceral muscles, organs and glands and restoring bodily function to normal state.
–> Take awhile to decrease due to sympathetic NS still lingering

Enteric: digestive system: helps regulate digestion