The Circulatory System

What is the main job of the circulatory system?

• To help with breathing

• To move food through the body

• To carry blood around the body

• To help us think

What organ pumps the blood?

(a)  

Which vessels carry blood away from the heart?

• Veins

• Arteries

• Capillaries

• Nerves

That part of the cardiac cycle when the heart contracts to force blood through the arteries.

(a)  

If the blood thickens...

• higher pressure is needed

• lower pressure is needed

• diastolic pressure is needed

• reduce the salt in the blood

What do veins do?

• Carry blood to the stomach

• Take blood away from the lungs

• Bring blood back to the heart

• Pump blood out of the body

What happens in the capillaries?

• The blood changes color

• Oxygen and nutrients are exchanged

• The heart pumps faster

• The blood stops

What does the blood carry to the body’s cells?

• Oxygen and nutrients

• Sugar and fat

• 
  Carbon dioxide
  

• Waste and dust

What is one waste the blood removes?

• Oxygen

• Protein

• Carbon dioxide

• Vitamins

What controls blood pressure?

• the lungs

• the vessels

• the liver

• the heart