RESPIRATORY AND CIRCULATORY SYSTEM

Arteries carry oxygen rich blood away from the heart.

• TRUE

• FALSE

This organ is the...

• lung

• heart

• blood vessel

• trachea

What is the main function of the respiratory system?

• gas exchange

• Produce hormones

• Regulate body temperature

• Digest food

Thin-walled vessels that allow for the exchange of O_{2 ,} CO₂, nutrients and wastes between blood cells or air sacs in the lungs

• Arteries

• Veins

• Capillaries

• blood cells

These are the...

• heart

• blood vessels

• lungs

• trachea

Which of the following is not a part of the circulatory system?

• 
  Arteries

• Liver

• Veins

• Heart

Carry blood away from heart; mostly oxygen-rich

• Arteries

• Veins

• Capillaries

• blood cells

This is the...

• 
  heart

• lung

• blood vessel

• trachea

Which blood vessels carry oxygen blood away from the heart to the cells?

• 
  Arteries

• Veins

• Capillaries

• blood cells

______________ are the smallest blood vessels.

• Arteries

• Veins

• Capillaries

• blood cells