Final-Brain, neuron, eye, ear

Regulates the amount of light entering the eye and gives the eye its color.

• Iris
• Lens
• Pupil
• Retina

Pupil

• Focuses light
• Clear tissue that covers the front of the eye
• Opening through which light enters the eye
• Layer of receptor cells

The clear tissue that covers the front of the eye.

• Lens
• Pupil
• Iris
• Cornea

What is letter B

• Optic nerve
• Lens
• Cornea
• Retina

What is letter G?

• Sclera
• Retina
• Lens
• Vitreous humor

This part of the eye carries the message from your eye to the part of your brain that controls vision. 

• cornea
• lens
• optic nerve
• retina

This part of the eye has photoreceptors called rods and cones.  They help us to see color and see at night.  It is called:

• optic nerve
• brain
• retina
• cornea

Select the three main parts of the nervous system.

• Muscles, spinal cord and nerves.

• Spinal cord, brain and nerves.

• Muscles, senses and brain.

What structure is grey in this picture?

• Cerebrum

• Cerebellum

• Brain Stem

The brain stem is labeled as #...

• 1

• 2

• 3