Digestive System Functions The Alimentary Canal Joke of

Digestive System Functions (The Alimentary Canal)

Joke of the Day:

Alimentary Canal: �The passage (including the esophagus, stomach, and intestines) that food passes through the body from mouth to anus

Types of Digestion �Mechanical (M): Chewing, churning of food in stomache �Chemical (C): Enzymes – From the Mouth to the Small Intestine

�Mouth (M, C) First Site of Digestion! ◦ (M) chewing ◦ (C) Salivary Amylase breaks down starch

�Pharynx(M) ◦ Initiates swallowing

�Esophagus (M) ◦ Transports food from mouth to stomach through “Peristalsis” �Peristaltic Waves: Waves of muscular contractions that propel contents from one point to another

�Stomach(M, C) (process food then transport) ◦ (M) churning to create a “Bolus” �Bolus: Creamy paste that forms as the food in th stomach is repeatedly mixed with gastric juices ◦ (C) HCl, pepsin kill bacteria and break down proteins

�Duodenum(C) ◦ 1 ST 10 inches of small intestine. Bile secreted here.

�Jejunum(M, C) ◦ Next 8 feet of small intestine. ◦ Food absorption, enzyme action.

�Ileum (M, C) ◦ “Terminal” portion of the small intestine ◦ Absorption of food, enzyme action

�Ascending colon(M) Part 1 of the Large Intestine. ◦ Water, Nutrient and Electrolyte absorption

�Transverse colon(M) Part 2 of the Large Intestine ◦ Water, Nutrient and Electrolyte absorption

�Descending colon(M) Part 3 of the Large Intestine ◦ Water, Nutrient and Electrolyte absorption

�Sigmoid colon(M) ◦ Water and Electrolyte absorption

�Rectum(M) ◦ Storage of feces

�Anal canal(M) ◦ Sphincter for “waste management”

Warning – Prolapsed rectum ahead!

�Prolapsed rectum

Laproscopic Nissen Fundoplication http: //www. youtube. com/watch? v=_U 8 oz 9 x. Cam. E