Lesson 5 Terms and Definitions

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Presentation transcript:

Lesson 5 Terms and Definitions Human Body Systems Lesson 5 Terms and Definitions

What happens to the bolus when it enters the stomach? Question of the hour… What happens to the bolus when it enters the stomach?

Digestion in the Stomach Food travels from the mouth Down the esophagus To the stomach Food remains in stomach up to 4 ½ hours

Longer time in stomach the smaller the food becomes!

What is all the gastric juice about? Glands are embedded in folds of stomach Glands Secrete HCL enzyme pepsin mucus

HCL? HCL stands for hydrochloric acid HCL = acid HCL’s job is to “activate” the enzyme pepsin to break down proteins

Pepsin Enzyme in stomach Chemically breaks down proteins

What about carbs and fats? NO NEW enzymes are introduced in the stomach to break down carbs or fats Mechanical digestion continues of carbs and fats through peristalsis

Mucus Coats stomach wall Protects against acidic gastric juices Ulcers – small perforation in the lining of the stomach wall. (not enough mucus) http://www.medical-look.com/diseases_images/stomach_ulcer2.jpg http://www.mayoclinic.org/images/peptic-ulcers-lg-enlg.jpg

Chyme The contents of the stomach turn to chyme Chyme – thick uniform liquid of broken down food, gastric juices, mucus, and enzymes.

Where does the food go next? Peristalsis (from stomach muscles) pushes food to the pyloric sphincter. Pyloric sphincter – the opening to the small intestines. Releases small amounts of chyme at a time into the small intestines.

Honey did I put the car in drive or reverse? What could go wrong? Honey did I put the car in drive or reverse?

Problems in stomach Heart Burn – food in the stomach backing up into the esophagus causing a burning sensation (NOT ACTUALLY IN HEART!) Treat with antacid (TUMS, or rolaids) Basic (Calcium - CaCO3) http://www.fastheartburnrelief.com/wp-content/uploads/2008/12/antacids.jpg

Problems in stomach Vomiting – reverse peristalsis, stomach and esophagus muscles moving in the opposite direction to get rid of stomach contents. Caused by reaction to a food or illness. http://tiny.abstractdynamics.org/archives/vomiting.jpg

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