Which of the following is not involved in chemical digestion?
Oral cavity
Stomach
Small intestine
Large intestine
The Correct Answer is D
A. Oral cavity is involved in chemical digestion through the action of salivary enzymes like amylase.
B. Stomach is involved in chemical digestion with gastric acids and pepsin.
C. Small intestine is a major site for chemical digestion and nutrient absorption.
D. Large intestine is primarily involved in the absorption of water and electrolytes and the formation of feces. It is less involved in chemical digestion compared to the other organs listed.
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Correct Answer is D
Explanation
A. Salivary glands are accessory organs of digestion as they secrete saliva containing enzymes to start digestion.
B. Liver is an accessory organ involved in digestion, particularly in bile production and processing nutrients.
C. Pancreas is an accessory organ that secretes digestive enzymes into the small intestine.
D. Spleen is not involved in digestion; it is primarily involved in immune function and blood filtration.
Correct Answer is B
Explanation
A. Chief cells secrete pepsinogen, not HCl.
B. Parietal cells in the stomach lining are responsible for secreting hydrochloric acid (HCl). This acid is crucial for digestion and killing pathogens.
C. Mucous cells secrete mucus, which protects the stomach lining from the acidic environment. They do not secrete HCl.
D. Regenerative (stem) cells are involved in the renewal of the stomach lining, but they do not secrete HCl.