Carbohydrate digestion begins in the____________ whereas protein digestion begins in the ___________.
liver; small intestine
mouth; stomach
small intestine; stomach
mouth; small intestine
The Correct Answer is B
A. Liver; small intestine: Carbohydrate and protein digestion do not begin in the liver or the small intestine. The liver is involved in metabolism but not in the initial digestion of carbohydrates or proteins.
B. Mouth; stomach: Carbohydrate digestion begins in the mouth with salivary amylase, while protein digestion begins in the stomach with pepsin.
C. Small intestine; stomach: Carbohydrate digestion begins in the mouth and not the small intestine. Protein digestion starts in the stomach, not the small intestine.
D. Mouth; small intestine: Carbohydrate digestion begins in the mouth, but protein digestion begins in the stomach, not the small intestine.
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View Related questions
Correct Answer is B
Explanation
A. 32; 36. Aerobic respiration, including glycolysis, citric acid cycle, and oxidative phosphorylation, can produce up to 36 ATP per glucose. Anaerobic fermentation, however, only produces 2 ATP per glucose, not 36.
B. 32; 2. Aerobic respiration, including glycolysis, citric acid cycle, and oxidative phosphorylation, typically produces up to 36 ATP per glucose, though 32 is a commonly cited figure depending on the specifics of the process. Anaerobic fermentation produces 2 ATP per glucose. The discrepancy in ATP production is due to differences in efficiency and accounting for the energy yield in different conditions.
C. 2; about the same, varying from one tissue to another. Anaerobic fermentation produces 2 ATP per glucose, but aerobic respiration (including glycolysis and subsequent steps) produces up to 36 ATP. The "about the same" part is not accurate for aerobic versus anaerobic processes.
D. 32; none. Anaerobic fermentation does produce ATP, specifically 2 ATP per glucose. Aerobic respiration produces up to 36 ATP per glucose.
E. 36; about the same, varying from one tissue to another. Aerobic respiration can produce up to 36 ATP per glucose, and anaerobic fermentation produces only 2 ATP per glucose. The ATP production difference is significant and not “about the same.”
Correct Answer is C
Explanation
A. Esophageal glands secrete mucus to lubricate the esophagus, but they do not cause acid reflux.
B. Pharyngeal constrictors are muscles that help in the swallowing process, not in preventing acid reflux.
C. The lower esophageal sphincter (LES) is a ring of muscle that controls the passage of food from the esophagus to the stomach. If the LES is weakened or relaxes inappropriately, stomach acid can flow back into the esophagus, causing acid reflux or "heartburn."
D. The upper esophageal sphincter controls the passage of food from the pharynx into the esophagus, but it is not involved in preventing acid reflux.