Question

Procedure 3 Time to Trace Now it's time to put all of the digestive anatomy and physiology together to get a "big picture" view of the digestive system. In this procedure you will trace the pathways of three different nutrients from their ingestion at the mouth to their arrival in the blood or lymph. You will trace a cookie (primarily carbohydrates), an egg (primarily protein), and greasy fried food (primarily lipids). Along the way, detail the following for each: 1. The anatomical pathay each takes from ingestion through its passage through the alimentary canal to its absorption into the blood or lymph. 2. The physical and chemical processes that break down each substance,lding enzymatic breakdown, churning. chewing, and emulsification Some hints: 1 Remember that digestion and absorption are quite different for lipids. For example, fats are not absorbed into the Use the text in this exercise for reference about the enzymes involved in the chemical digestion of each nutrient. Tracing Steps Cve 1 Cookie: Start: mouth * blood End UNIT 14 1 373 Digestive System

Answer 1

1. Food enters the mouth moves through pharynx larynx esophagus upper and lower esophageal sphincter, stomach, small intestine it is absorbed

2 food is broken down by chewing in the mouth emulsified with salivary enzymes rich in Amylase which digests the carbohydrates, moves through the pharynx larynx esophagus, reaches the stomach where gastric acid open the protiens activate pepsinogen to pepsin which digests the proteins and then carbohydrates and proteins are absorbed in the pylorus and first part of duodenum. Food is acted upon by lipase from pancreas in the second part of duodenum and is absorbed in the third part of duodenum and ileum. Fat enters enteric circulation acted upon by bike furthers breaks it to triglycerides and cholesterol