IGCSE S6

Any change in the internal/external environment is called a ______.

Where are receptors located?

• sense organs (👁️, 👂, 👃, 👅,🖐️)

• legs 🦵

• nerves 👤

• head 🧠

What is the nervous system made of?

State the 3 main types of neurones (select 3)

• CNS

• sensory neurones

• relay neurones

• motor neurones

The CNS consists of the _____ and the _____ only. [choose 2]

• kidneys

• brain

• heart

• spinal cord

What happens (in order) when receptors in a sense organ detect stimulus?

• detect a stimulus,

  send electrical impulses along sensory neurones to the CNS

• detect a stimulus,

  send electrical impulses along sensory neurones to the receptors

• detect a stimulus,

  send electrical impulses along sensory neurones to the brain

• detect a stimulus,

  send electrical impulses along sensory neurones to the nerves

Coordinated responses always need 3 things

• a stimulus

• a motor neurone

• a receptor

• an effector

The connection between two neurones is called a _____ .

The nerve signal is transferred by chemicals called ______ which diffuse across the gap.

The route taken by the information in a reflex (from receptor to effector) is called a ______ .