DIGESTION. By Erin and Courtney . Evolution. Two types of digestion Intracellular: Break down of macromolecules takes place within the cell. Extracellular: Break down of macromolecules takes place outside of the cell. Advantages of extracellular digestion with evolution
By Erin and Courtney
Protists : Obtain their food by filter feeding, or absorbing there food by engulfing it to form a food vacuole. Food is then taken within the cell through endocytosis.
Echinoderms: They exhibit a wide range of feeding habits including; suspension feeders, deposit feeders, carnivores, browsers and parasites. They mostly digest their food externally.
Worms: Have a sac-like gut, in which they take in their food and digest extracellular
Mollusks: Have a gut into which is also used to digest their food
This is all done through a somewhat simple process. Gastric juices that come from the stomach walls and the wall muscles, help churn the food and break it down. The gastric juices also aid in killing any harmful bacteria that may be in the food.
* The small intestine is actually 22 feet long…that’s 22 notebooks lined up!
Celiac disease: Celiac disease is a digestive disease that damages the small intestine and interferes with absorption of nutrients from food. People who have celiac disease cannot tolerate gluten, a protein in wheat, rye, and barley.
Gastroesophageal reflux disease (GERD) is a more serious form of gastroesophageal reflux (GER), which is common. GER occurs when the lower esophageal sphincter (LES) opens spontaneously, for varying periods of time, or does not close properly and stomach contents rise up into the esophagus. AKA: acid reflux or acid regurgitation