| A | B |
|---|
| Muscle tissue | the ability to contract, or shorten |
| Connective tissue | provides support and connects different body parts |
| Nerve tissue | carries messages back and forth |
| Epithelial tissue | forms a protective surface |
| Hormones | chemical messengers that regulate certainactivities |
| Enzymes | chemicals that help to break down food into simpler substances |
| Organ system | group of organs that work together to perform a specific function |
| Organ | group of different tissues with a specific job |
| Heart | pumps blood throughout the body |
| Lungs | main respiratory organ |
| Tissue | group of similar cells that perform the same function |
| Small intestine | organ in which most digestion takes place |
| Skeletal system | protects, supports, allows movement, produces blood cells |
| Muscular system | allows body movement and maintains posture |
| Digestive system | breaks down food and absorbs nutrients |
| Circulatory system | transports nutrients, wastes, and other materials |
| Respiratory system | exchanges oxygen and carbon dioxide between blood and air |
| Nervous system | detects sensation and contols most functions |
| Excretory system | removes solid and liquid waste |
| Reproductive system | Performs reproduction and male and female functions |
