Systems of the Human Body

A(n) _____ can be passed from one organism to another.

• vaccine
• infectious disease
• immune system

Most of the muscles in your body are skeletal muscles. Skeletal muscles are ___________. 

• voluntary
• involuntary
• weak

Organisms that cause some diseases are _____.

• vaccines
• pathogens
• voluntary muscles

A _____________ is a kind of medicine that protects you from a disease.

• pathogens
• immune systems
• vaccine

The _____ is made up of cells in your blood and other tissues and helps protect you from pathogens.

• immune system
• voluntary muscles
• infectious diseases

Muscles that you cannot control are ____________ muscles. You use these muscles to breathe and digest food.

• voluntary
• involuntary

____________ are the basic working unit of the 
 nervous system or the nerve cell.

• vaccines
• neurons
• pathogens

Soda pop and potato chips help build strong bones.

• True
• False

You can help protect yourself from getting sick by eating healthful foods, getting plenty of rest and exercise, and washing your hands often.

• True
• False

Smiling, running, and chewing are actions controlled by involuntary muscles.

• True
• False