The Nervous System

Question 1

Key features

Answer 1

A specialised network of cells and our primary communication system. Two main functions:
- To collect, process and respond to information in the environment
- To co-ordinate the working of different organs and cells in the body.
Divided into the central nervous system and the peripheral nervous system

Question 2

Structure + function of the CNS

Answer 2

• Made up of the brain and spinal cord
• The brain is the centre of all conscious awareness
• Cerebral cortex is very developed in humans and is what distinguishes our higher mental functions from those of animals
• The spinal cord is an extension of the brain and is responsible for reflex actions
• It passes messages from the brain and connects nerves to the PNS

Question 3

Structure + function of the PNS

Answer 3

• The PNS transmits messages, via millions of neuron’s, to and from the nervous system
• PNS is further divided into the autonomic nervous system and the somatic nervous system
• The ANS governs vital functions in the body such as breathing, heart rate, digestion, sexual arousal and stress responses
• The SNS controls muscle movement and receives information from sensory receptors.