Micelles facilitate absorption by microvilli where the fatty acids and proteins

Micelles facilitate absorption by microvilli where

This preview shows page 537 - 539 out of 741 pages.

Micelles facilitate absorption by microvilli, where the fatty acids and proteins diffuse out to form lipoproteins. B Micelles are lipoproteins designed for the transport of lipids that enter lacteals. Micelles facilitate absorption by microvilli, where the fatty acids and monoglycerides diffuse out to form triglycerides. C Micelles are fatty acids and phospholipids surrounded by bile salt. Micelles facilitate absorption by microvilli, where the fatty acids and monoglycerides diffuse out to form triglycerides. D Micelles are fatty acids and monoglycerides surrounded by bile salt. Micelles facilitate absorption by microvilli, where the fatty acids and monoglycerides diffuse out to form triglycerides. 51 On a cellular level, why must food be broken down? A Large molecules present in intact food pass through the digestive epithelium and enter the cell through the nuclear membrane, thereby damaging the membrane. Hence the molecules must be broken down. B Fats present in intact food contain very large molecules, which cannot pass through cell membranes. Fats need to be passed through the digestive epithelium to be utilized. C Large molecules present in intact food cannot pass through cell membranes. Nutrients need to be passed through the digestive epithelium to be utilized. D Large molecules, if not broken down, produce toxic substances that pass through the epithelium of the digestive tract and are absorbed by cells. This can be lethal to the cell. Solution The solution is (C). Large molecules of proteins, carbohydrates, and lipids in intact food cannot pass through cell membranes. Nutrients need to be passed through the digestive epithelium to be utilized.
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25 | Animal Nutrition and the Digestive System 529 Advanced Placement Biology Student’s Solution Manual Copyright 2018, Rice University. All Rights Reserved. This ancillary resource is intended for student use only and may not be uploaded, redistributed, or reproduced without written approval by OpenStax. 52 What is the importance of neural responses to food stimuli? A Neural responses facilitate secretion of fumarase needed for chemical digestion of food as well as other involuntary responses like peristalsis. B Neural responses facilitate secretion of enzymes needed to digest or break down food as well as to enable other involuntary responses like segmentation in the stomach. C Neural responses facilitate secretion of enzymes needed to digest or break down food as well as to enable other involuntary responses like peristalsis. D Neural responses facilitate secretion of salivary amylase needed to digest or break down food as well as to enable secretion of hormones like secretin and gastrin. 53 How do hormones regulate digestion? A Hormones regulate aspects of digestion such as increasing the peristaltic movements in the esophagus when food is sensed.
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