Which system is the heart in?

• Circulatory
• Digestive
• Cardiovascular

Which system are the lungs in?

• respiratory
• digestive
• excretory

Which system is the stomach in?

• respiratory
• digestive
• nervous

What blood vessels take blood away from the heart after oxygen is addels

• veins
• arteries
• capillaries

Where does digestion start?

• stomach
• mouth
• esophagus

When you breathe, your lungs take in ___ and remove ___. 

• air/oxygen
• oxygen/carbon dioxide 
• carbon dioxide/waste 
• waste/air 

What are the main organs of gas exchange in the respiratory system?

• diapragm
• lungs
• trachea
• bronchi

Red blood cells transport __________ around our body.

• oxygen
• plasma
• bones
• cardiac muscles

Arteries carry oxygen rich blood away from the heart.

• True
• False

Veins carry oxygen poor blood back to the heart.

• False
• True