A nerve cell which transmits electrical impulses between different parts of the body.

The part of a neurone which carries the signal.

A fatty coating on the neurone which insulates it.

A chemical transmitter which crosses the synapse and triggers the onward response.

Neurones and synapses

Biology

The human nervous system

Human reaction time: practical

The structure and function of a reflex arc

The human eye

Common defects of the human eye

The human brain

Pupils will learn how hormones and glands of the human endocrine system enable us to coordinate and control changes in our bodies.

Pupils learned how substances essential for chemical reactions in living cells, and the products of the reactions, are transported into, around and out of the human body, and the implications of surface area:volume ratio.

This unit explores the structure and function of the nervous system, including the CNS, reflex arcs, and the eye. It covers brain structure, common eye defects, and the challenges in treating nervous system damage. It also addresses ethical considerations.

Coordination and control: the human nervous system

Transmits electrical impulses between neurones within the CNS.

Transmits electrical impulses from the receptor to the CNS.

Transmits electrical impulses from the CNS to the effector.

Match the type of neurone to its function.

What sort of tissue is the myelin sheath made of?

What effect does having a myelin sheath have on nerve impulses?

What are the chemicals called that diffuse across the synapse?

The nerve signal triggers vesicles (packets) of neurotransmitters.

The neurotransmitters are released into the synaptic gap.

The neurotransmitters diffuse across the gap and bind to a receptor.

Put these steps in order, to show how a nerve impulse passes from one neurone to another.

Which of the following is **not** a stimulus?

Cells that detect a change in the environment.

A nerve cell which transmits electrical impulses.

A muscle or gland which carries out a response.

Put these in order to show how a message moves through the nervous system, starting with detecting the stimulus.

Neurones and synapses

Lesson outcome