Muscles and glands are both a type of this.

This cell carries messages from a sense organ to the CNS.

Something that detects a stimulus.

The cell that carries an impulse to an effector.

This cell passes messages to other nerve cells.

The organ that coordinates most of our responses.

This part of the nervous system runs inside your backbone.

It kills microbes on surfaces e.g. bleach.

The transparent front of the eye.

This part of the eye focuses light rays to a point.

 The tough outer layer of the eye.

The nerve that carries impulses from the eye to the brain.

These muscles change the shape of the lens.

They connect the lens to the ciliary muscles.

This part of the eye is light sensitive.

The hole through which light passes.

This muscle controls how much light gets in the eye.

This effector secretes something.

This is an automatic response.

This is what glands do.