What is a bundle of nerve cells?
spinal cord
What is the round hole that lets the right amount of light in?
pupil
To move rapidly back and forth
vibrate
What are parts of your body designed to help you respond to the world?
sense organs
What sense does the nose do?
smell
What system is a network of nerves?
nervous system
What keep dust and other objects out of eyes?
eyelids
What energy helps you to see?
light
What is the ring of muscles that controls the amount of light that enters your eye?
iris
What is like window screens and also keep dust from your eyes?
eyelashes
How many senses are there?
5
What helps to wash out dust and dirt from your eyes?
tears
What is the part in the back of the eye where the picture is made; it is connected to the optic nerve?
retina
What sense does the tongue do?
taste
What is the nerve that carries the message of sight to your brain?
optic nerve
Tissue is a group of cells working ______.
together
What sense do the ears do?
hearing
What sense does the skin do?
touch
What sense do the eyes do?
sight
What controls your whole body?
brain
Cells are known as what?
building blocks
Sound vibrations traveling through the air
Sound Waves