1.Which statement about body systems is true? A. Your body is made up of exactly seven systems.B. The nervous system is more important than any other body system.
C. All of your body systems must work together to keep you healthy.
D. Each of your body systems works by itself to keep you healthy.

2.Which is the correct arrangement of units or level organization of living things from the smallest to the biggest? *
A. tissue -> cells -> organs -> systems
B. cells -> tissue -> organs -> systems
C. organs -> cells -> tissue -> systems
D. systems -> organs -> cells -> tissue

3.With circulation the heart provides your body with …. *
A. oxygen
B. nutrients
C. a way of getting rid of waste products
D. all of the above

4.De-oxygenated blood goes from body parts to …. *
A. heart
B. lungs
C. kidneys
D. head and forelimbs

5.When humans breathe in air, our diaphragm moves … and the chest gets …. *
A. upwards, upwards
B. upwards, inwards
C. downwards, bigger
D. downwards, smaller

6.What is the main function of the respiratory system? *
A. to break food down
B. supply the blood with oxygen
C. circulate the blood
D. controlling the body

7.The trachea is a part of the respiratory system. What can the trachea also be called and what is its function? *
A. windpipe, filters the air we breathe
B. windpipe, releases air out of the body
C. tubes; carries air to the lungs
D. tubes; releases air to the lungs
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