The Nervous System

Question 1

NS definition

Answer 1

1) A network of cells

2) 2 functions:

Collect x respond to info

Coordinate organ x cells

3) Divided into:

Central NS

Peripheral NS

Question 2

The CNS

Answer 2

Made up of brain x spinal chord

Origin of complex dmds x decisions

Passes messages to x from brain

Connects nerves to PNS

Question 3

The Brain 🧠

Answer 3

1) centre of conscious awareness

2) cerebral cortex=
developed in humans=
distinguishes higher mental functions from animals

3) Divided into 2 hemispheres (H):
Left x Right
Each H = 4 lobes: F, O, P, T

Question 4

Spinal chord (3)

Answer 4

1) extension of brain

2) reflex actions 🔥

3) passes messages to x from brain
Connects nerves to PNS

Question 5

Peripheral NS (PNS)

Answer 5

1)From CNS to muscles x glands

2) transmits messages
via millions of neurons

3) divided :
Autonomic
Somatic

Question 6

Autonomic NS (4)

Answer 6

1) transmits info from internal bodily organs

2) involentary

3) 2 divisions
Parasympathetic
Sympathetic

4) Governs bodily functions:
HR, digestion, breathing + stress response

Question 7

Somatic NS

Answer 7

Voluntary x conscious

1) transmits info from receptor cells -> CNS

2) Recieves info from CNS - directs muscles to contract

3) controls muscle movement

4) receives info from sensory receptors

Question 8

Parasympathetic NS

Answer 8

Relaxes internal organs

Decreases bodily activitites=
Conserves rescources

REST N DIGEST

Question 9

Sympathetic NS

Answer 9

Activates internal organs

E.g FIGHT OR FLIGHT 🤜✈️

+ HR

Opposite of para NS