Any change or signal in the environment that an organism can recognize and react to is called ______.

The nervous system includes...

individual nerve cells that carry information through your nervous system are called _____.

The message that a neuron carries is called a ____________.

A ___________ picks up a stimulus and converts it into a nerve impulse.

An __________ carries a nerve impulse to another_______ or to a motor neuron.
Most of your _______ are located in your brain.

A ___________ sends an impulse to a muscle or gland, enabling it to respond . They carry nerve impulses to muscles and glands.

Includes the brain and spinal cord.

Include all the nerves outside of your central nervous system, involves both voluntary and involuntary actions.

The two groups of nerves in the PNS.

Where you think and store memories.

Controls balance (movement) and coordination.

Controls involuntary muscles.

Your brain has about ______ neurons, all of which are ______.

The brain stem connects to the __________.

A ring that controls the amount of light that enters the eye.

The opening that lets light into the eye.

Then they pass through the ______.

The ______ contains light sensitive cells that produce nerve impulses. (Located in the back of your eye.)

These impulses travel through the ______.

Four main taste sensations.

Your tongue is covered with tiny bumps called _________. Most _______ contain taste buds.

An __________ is a nerve cell that responds to chemical molecules in the air.

Most sounds are caused by...

What sense is not like the others and why?

All of our touch receptors are located in the _______, or the inner layer of the skin.

One of your most important sensations because it alerts you to danger.

Your body's two systems that regulate its activities.

Which system regulates short term and long term activities by sending chemicals throughout the body?

A ______ is an organ that produces or releases a chemical.

A chemical produced by an endocrine gland is called a _______.

This kicks in when you're angry, frightened, or excited.

Cells that are specialized in a way that enables them to recognize hormone's chemical structure.

Both the nervous and endocrine system work together. The part of your brain that links the two systems in the _______.