| A | B |
|---|
| cell | the smallest unit of living matter |
| tissue | a group of similiar cells that work together at the same job. |
| organ | a group of tissue that work together to carry out a specific body function |
| organ system | a group of organs that work together to do a certain job |
| organism | any living thing that maintains various vital processes necessary for life |
| nervous system | made up of your brain, your spinal cord, and an enormous network of nerves that thread throughout your body, it's the control center for your entire body |
| skeletal system | supports the structure, gives it shape, protects vital organs and serves as an attachment for the muscles |
| integumentary system | made up of your skin, hair and nails and glands in the skin, it is the protective system for the body |
| muscular system | helps control the movement of your body, surrounds your bones and body organs, gives form and support, makes movement possible, and produces heat |
| circulatory system | composed of a group of organs which transport food and oxygen to and removes waste from every cell in the body |
| respiratory system | brings oxygen into the body and removes carbon dioxide and other gases |
| digestive system | made up of a series of hollow organs joined in a long, twisting tube from the mouth to the anus - and other organs that help the body break down and absorb food |
| excretory system | removes waste from the body |
| endocrine system | glands that secrete hormones directly into the bloodstream |
| reproductive system | the system that controls reproduction in the body |
| immune system | helps the body fight disease |
