Human Body Systems

3. Messages are carried back and forth between the brain and every part of the body by what?
5. How do muscles reproduce?
6. Which organ of the excretory system stores urine until the body is ready to eliminate it?
8. Which excretory organ eliminates water, salt, and some chemical wastes when you perspire (sweat)?
9. The nose produces a substance in order to put moisture in the air and catch dust and bacteria.
10. What is the name of the small flap of tissue that seals off the trachea during swallowing?
12. Which gland in the brain controls hormones involved in growth and puberty?
13. What substance in the mouth contains an enzyme that begins chemical digestion?
14. Grape-like clusters of air sacs within the lungs are called
16. What substance coats and protects the inside of the stomach?
17. A group of cells that perform a similar function is called…
18. Carbohydrates, like the sugar glucose, are the body’s main source of what?

1. What connects arteries and veins?
2. Which body system makes blood cells?
4. Blood vessels that carry blood away from the heart are called
6. Which parts of the respiratory system divide into smaller and smaller tubes, looks like tree branches.
7. Which type of human body tissue can contract or shorten?
11. The thick column of nerve tissue that links the brain to most of the nerves in the peripheral nervous system
15. The dome-shaped muscle that plays an important role in breathing