Multiple Choice
Which of these structures contains digestive enzymes?
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23. The Digestive System
Introduction to the Digestive System
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In which organ does protein digestion begin?
A
Esophagus
B
Stomach
C
Mouth
D
Small intestine
Verified step by step guidance1
Understand that protein digestion involves breaking down proteins into smaller peptides and amino acids.
Recall that the digestive system is composed of several organs, each with specific functions in the digestion process.
Identify the role of the stomach in digestion: it secretes gastric juices, including hydrochloric acid and the enzyme pepsin, which are crucial for protein digestion.
Recognize that the stomach is the first organ where significant chemical digestion of proteins occurs, as pepsin begins breaking down protein molecules.
Conclude that while mechanical digestion starts in the mouth, the chemical digestion of proteins specifically begins in the stomach.
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