Circulatory System

About how big is the human heart?

• the size of your nose

• the size of your foot

• the size of your fist

• the size of your ear

As the blood reaches the lungs, what is removed from the blood?

• oxygen

• carbon dioxide

• red blood cells

• white blood cells

The main function of the circulatory system is 

• To give the body structure and support
• Excrete waste
• transport blood, nutrients, and gases throughout the body
• to transport messages from the body to the brain

The part of the blood that carries oxygen is called ___________. (Remember we can't live without our blood-line)

• red blood cells

• white blood cells

Veins carry oxygen poor blood back to the heart.

• False

• True

______________ are the smallest blood vessels.

• Arteries
• Veins
• Capillaries

The heart has ___ chambers.

• 1
• 2
• 3
• 4

Which of the following organs fits the definition?

•they carry oxygen and nutrients away from your heart to your bodies tissues

• veins

• arteries

• lungs

• heart

What is the yellow substance that takes up 54.3% of blood?

• Red Blood Cells

• White Blood Cells

• Platelets

• Plasma

Which is responsible for blood clotting?

• Red blood cells

• White blood cells

• Plasma

• Platelets