| A | B |
|---|
| Heterotrophs | obtain their food from organic molecules produced by other organisms |
| Ingestion | the process of taking food into the body |
| Digestion | the breakdown of ingested food into smaller components that can be used by the cells |
| Absorption | cells lining the digestive tract take up the small molecules produced by digestion and transport them to the blood (from which they are transported to other areas of the body) |
| Elimination | the excretion of undigested material and waste products of digestion |
| Excretion | the elimination of nitrogenous wastes from the body |
| Parasites | feed by absorbing predigested nutrients from a host organism |
| Clam | a suspension feeder |
| Earthworm | a susbstrate feeder |
| Tick | a fluid feeder |
| GVC | a gastrovascular cavity (a single opening that serves as both mouth and anus |
| Typhlosole | a structure found in the earthworm which serves to increase the surface area of the intestine |
| Peritoneum | in the fetal pig, it lines the coelom |
| Parotid, mandibular, sublingual | are salivary glands |
| Glottis | the opening to the trachea |
| Rugae | the ridges inside the stomach of the fetal pig |
| Duodenum, jejunum, ileum | components of the small intestine |
| Gall bladder | stores bile |
| Liver | amond other things, it produces bile |
| Pancreas | an elongated glandular mass that produces many digestive enzymes |
| Pyloric valve | controls the entrance of digested food into the small intestine |
| Cardiac valve | prevents food from moving back up the esophagus once it reaches the stomach |
| Ileocaecal valve | controls the movement of material from the small intestine into the large intestine |
| Urea | a nitrogenous excrectory compound of reptiles, birds and adult insects |
| Planiarian worm | excretory system are protonephridia |
| Grasshopper | excretory system are Malpighian tubules |
| Kidney | the main organ responsible for excretion and osmoregulation in vertebrates |
