These send messages from the brain to the body.

This is what we need to live and the reason we breathe.

This is the number is chambers found in the heart.

The main function of this organ is to pump blood through the body.

This sensation tells us that there is a problem that needs to be fixed.

This protects the brain.

This is a gas our bodies produce and expel.

These blood vessels carry blood away from the heart.

The main function of this organ is to transport oxygen into the body and remove carbon dioxide.

This organ controls our breathing.

This part of the brain controls involuntary activities.

This one is smaller in order to make room for the heart.

This is the colour of oxygenated blood.

The main function of this organ is to control every part of the body.

It is the average number of heart beats per minute at rest.

This part of the brain allows me to raise my hand when I want to answer a question.

This is a short tube in the throat that allows us to make sound.

This action forces the person's heart to continue to pump blood and puts oxygen into their system.

These prevents blood from flowing backwards.

This tube is also known as the windpipe. Air flows through it to our lungs.

This part of the brain helps me to remain upward and steady when I walk.

This is the name of the sac where we exchange oxygen and carbon dioxide.

This vein connects the lung back to the heart and is the only vein that carries oxygenated blood.

This occurs when a blood clot blocks a vein or artery in the brain preventing oxygen from going to a specific part.

Damage to this can cause paralysis or death.