Multiple Choice
Which part of the digestive tract is the predominant location for water and mineral absorption?
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39. Digestive System
Digestion
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Which of the following plays a role in both physical and chemical digestion?
A
Teeth
B
Saliva
C
Villi
D
Gall bladder
Verified step by step guidance1
Understand the difference between physical and chemical digestion: Physical digestion involves breaking down food into smaller pieces without altering its chemical structure, while chemical digestion involves breaking down food molecules into simpler substances using enzymes and other chemicals.
Analyze the role of each option: Teeth are involved in physical digestion by mechanically breaking down food into smaller pieces. Villi are structures in the small intestine that absorb nutrients but do not directly participate in digestion. The gall bladder stores bile, which aids in chemical digestion but does not perform physical digestion.
Focus on saliva: Saliva is produced by salivary glands and plays a dual role in digestion. It contains enzymes like amylase that chemically break down carbohydrates, and it also moistens food, aiding in physical digestion by making it easier to chew and swallow.
Conclude that saliva is the correct answer because it contributes to both physical digestion (moistening food) and chemical digestion (enzyme activity).
Review the concept of dual-function substances in digestion to reinforce understanding of how saliva fits into both physical and chemical processes.
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