| A | B |
|---|
| cells | the smallest form of life |
| tissues | a group of cells performing a specific function |
| organs | a group of tissues performing a specific function |
| organ systems | a group of organs performing a function |
| epithelial tissue | type of tissue that includes skin cells |
| connective tissue | type of tissue that includes blood cells, bone cells, etc |
| muscle tissue | type of tissue that includes muscle cells, heart cells, etc |
| nervous tissue | type of tissue that includes brain cells, nerve cells, etc |
| nervous system | includes the brain, spinal cord, and nerves |
| digestive system | responsible for the ingestion and digestion of food |
| circulatory system | transports substances around the body, includes the heart |
| respiratory system | responsible for gases into and out of the body |
| skeletal system | provides internal support and body movement |
| muscular system | includes muscles and tendons |
| excretory system | responsible for removing waste products from our blood |
| endocrine system | includes glands and hormones |
