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

• infectious disease
• vaccine
• neuron

Skeletal muscles are _____. These are muscles that you can control.

• involuntary muscles
• voluntary muscles

Organisms that cause some diseases are _____.

• infectious diseases 
• pathogens
• immune system 

A(n) _____ can make you immune to a disease without having the disease. 

• vaccine
• pathogens
• immune system

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

• voluntary muscles
• vaccines
• immune system

_____ are muscles that you are not able to control. Your lungs are an example of these types of muscles.

• voluntary muscles
• involuntary muscles

A(n) _____ receives and sends electrical messages.

• pathogens
• neuron
• immune system

Which structure is the link between the brain and the rest of the body?

• the esophagus
• the vertebrae
• the spinal cord

Muscles that help your bones move are _________. 

• skeletal muscles
• cardiac muscles
• smooth muscles

Most food is digested and absorbed in the __________.

• mouth
• small intestine
• large intestine