| A | B |
|---|
| carnivore | meat eater |
| herbivore | plant eater |
| omnivore | plant and meat eater |
| filter feeder | trap and eat microscopic organisms |
| radula | a flexible tongue like ribbon of tiny teeth |
| digestion | breaking down food |
| digestive system | an organ system that breaks down food |
| anus | opening which waste passes from |
| crop | birds store food here |
| gizzard | grinds up food |
| esophagus | tube that connects the mouth to the stomach |
| intestine | organ where digestion is completed |
| stomach | food is partially broken down |
| cellular respiration | cells use oxygen |
| diffusion | particles move from an area of high concentration to low concentration |
| respiratory system | skin, gills, and lungs |
| gills | feather like structures where gas is exchanged |
| lungs | sac like structures for air and blood |
| cirulatory system | transports material to cells and takes away wastes |
| heart | hollow muscular structure that pumps blood |
| open circulatory system | a system in which the heart pumps blood into open spaces in the body and blood is not confined to blood vessels |
| closed circulatory system | blood moves only within the network of connected blood vessels and the heart |
| capillaries | tiny, thin walled blood vessels |
| atrium | chamber of heart that receives blood from body |
| ventricle | chamber that receives blood from atrium |
| excretory system | system that rids the body of nitrogen-containing waste and excess salt and water |
| kidneys | main organs that filter nitrogen-containing waste from the blood |
| urine | watery fluid that contains waste |
