Body Systems

6. Chemical messenger released in blood to regulate an organism's growth and development is called _?_.
7. Body system that is composed of hormone-producing glands.
9. Humans belong to the _?_ kingdom.
11. Stable internal environment of an organism is described as _?_.
13. Organ that produces hormones regulating egg development.
14. Group of organs that perform closely related functions is called "organ _?_".
15. Cell part that regulates molecular transport in and out of the cell.
16. Specialized nervous system cell that is able to transmit electrical impulses.
17. Tough protein that makes up hair and protects the tips of your fingers and toes.
18. Smallest unit of life.

1. "Under-skin" layer that contains fat cells for insulation and energy storage.
2. Organ that produces hormones regulating glucose level in blood.
3. Skin contains _?_ glands used for thermoregulation and waste removal.
4. Structure that performs a certain function in a multicellular organism (ex: liver, eye).
5. Body system that regulates body temperature and acts as a protective barrier against pathogens.
8. Electrical communication system throughout the body.
10. Top layer of skin.
12. Neurons are made of 3 major parts: dendrites, body, and an _?_.
14. Nervous system allows humans to collect information about the world around us through 5 _?_.