Nutrition, Digestion, exchange; Respiratory and Circulatory

Match it! Select the correct answer from the pull down...Good luck!

What gas is the waste product of respiration?

What are nutrients?

What is the main function of the excretory system?

What type of tine blood vessel surrounds alveoli (found in your lungs)?

What is the job of the red blood cells?

What is the difference between mechanical and chemical digestion?

What are proteins made of?

What is the job of a platelet?