Circulatory and Respiratory Systems

Select the best answer(s) for the following question:

The main organ in the circulatory system is the

• heart

• lungs

• brain

• stomach

What is the watery part of your blood your cells are floating in?

• platelets

• white blood cells

• red blood cells

• plasma

What can you do to prevent a heart attack?

• Eat heathy foods

• Exercise

• Don't smoke

• All of the above are true

The main organ in the respiratory system is the

• lungs

• trachea

• nose

• mouth

How many chambers does the heart have?

• 2

• 4

• 6

• 8

What do your valves do?

• They keep blood flowing in one direction

• They open and shut when your heart pumps

• They make the sound of your pulse

• All of the above are true

Is your heart made of voluntary or involuntary muscle?

• Involuntary

• Voluntary

What part of your blood carries oxygen to the rest of your body?

• Plasma

• Platelets

• White blood cells

• Red blood cells

What part of your blood stops you from bleeding when you get a cut?

• Plasma

• Platelets

• White blood cells

• Red blood cells

Why is the diaphragm important?

• It is a muscle that controls your breathing

• It controls blood flowing through your body

• It controls the movement of valves in your heart

• None of the above