Reflex action revision.Key points.

•A receptor detects a stimulus –this can be anything that causes a sense organ to activate.

•A sensory neurone transmits the electrical impulse.

•At the junction between two neurones, the synapse, chemical transmitters are released.

Reflex action revision.Key points.

•A relay neurone passes the impulse on within the CNS (this is often shaded grey).

•A motor neurone is then stimulated.

•This impulse is then sent to the effector, this can be a muscle or a gland.

•Action is taken.