| Term | Definition |
| Skeletal | composed of bones and certain cartilages. |
| Muscular | consists of all skeletal muscles specialized of contraction |
| Nervous | consists of the brain, spinal cord and nerves arising from them. |
| Circulatory | consists of heat and blood vessels and the lymphatic system. |
| Digestive | composed of oral cavity, pharynx and gut together with accessory glands |
| Respiratory | comprising of lungs and a system of air passages of oxygen and carbon dioxide. |
| Urinary | composed of kidneys and urinary bladder. |
| Reproductive | organs concerned with reproduction |
| Endocrine | consists of ductless glands. |
| Integumentary | the skin and its appendages. |