3.People your age have about 1 gallon (4L) of blood in their bodies?


4. Your blood contains more white blood cells than any other kind?


5. Food substances, oxygen, and wastes pass in and out of your blood through
the artery walls?

6. Most people cannot go much longer than a minute without breathing?


7. Your respirator system moves carbon dioxide from the air into your blood?


8. Your respiratory organs
clean and warm the air you breathe?


9. Food passes through your trachea to your stomach?



10. Digested food material enters your blood from your stomach?


11. Your kidneys remove most extra water and cell wastes from your blood?


12. Parts of your skeleton help protect your inner organs?


13. Some muscles pull while others push?


14. Your nerves carry messages between
your brain and the rest of your body?


15. Your brain sends and receives messages
only when you are awake?


Truth or false to all these questions