A reflex action is controlled by the:

Draw a labelled diagram of the human eye and name the part that changes the focal length of the lens.

State three differences between the sympathetic and the parasympathetic nervous systems.

Define a reflex action and describe the path of the reflex arc when the hand touches a hot object.

What is a synapse, and how is an impulse carried across it?

Name the three parts of the human brain and state one function of each.

Distinguish between a sensory, a motor and a relay neuron.