Science Of Agriculture Biological Approach
5th Edition
ISBN:9780357229323
Author:Herren
Publisher:Herren
Chapter20: A Safe Food Supply
Section: Chapter Questions
Problem 2SLA
Related questions
Question
Pancreatic juices, saliva, and bile are used only for mechanical digestion?
A. True
B. False
Expert Solution
Step 1
Mechanical digestion comprises physically breaking down food items into smaller chunks in order for chemical digestion to proceed more quickly. During mechanical digestion, food is broken down physically but not chemically. Teeth are used to chew and break down food in mechanical digestion.
Digestive enzymes further degrade the molecular structure of ingested substances into a state that can be absorbed into the bloodstream during chemical digestion. Food is broken down mechanically through peristalsis and segmentation, which are muscle contractions.
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