Nokea
Carbohydrates are comprised of carbon, , and oxygen.
- A. iron
- B. hydrogen
- C. nitrogen
- D. sulfur
Correct Answer: B
Rationale: Carbohydrates consist of carbon, hydrogen, and oxygen in a specific ratio.
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Which process matches the definition: The uptake of substances by the GI tract?
- A. Absorption
- B. Ingestion
- C. Peristalsis
- D. Assimilation
Correct Answer: A
Rationale: Absorption is the process by which nutrients are taken up from the GI tract into the bloodstream.
What are the substrate and end-products of digestion by the enzyme lipase?
- A. substrate: triglycerides, end-products: fatty acids and glycerol
- B. substrate: proteins, end-products: amino acids
- C. substrate: carbohydrates, end-products: monosaccharides
- D. substrate: nucleic acids, end-products: nucleotides
Correct Answer: A
Rationale: Lipase hydrolyzes triglycerides into their component fatty acids and glycerol.
Match: Lacteal
- A. absorbs fat within the villi
- B. transports oxygen
- C. produces mucus
- D. secretes enzymes
Correct Answer: A
Rationale: Lacteals are lymphatic capillaries within the villi that absorb dietary fats.
Cardiac glands of stomach, all true except:
- A. Present in the narrow band 10-40 mm wide around the esophageal orifice
- B. Lined by secreting cells that secrete mucous and few lysozymes
- C. Few parietal cells for HCL secretion and some enteroendocrine cells that secrete gastrin.
- D. Pits are relatively deep, occupying one half of the thickness of the mucosa
Correct Answer: D
Rationale: Cardiac gland pits are shallow, not deep, occupying less than half the mucosal thickness, unlike fundic glands.
The intestine has a large surface area. Why?
- A. To make the passage of nutrients through the intestine faster
- B. To make the passage of nutrients through the intestine slower
- C. To make absorption of nutrients more efficient
- D. To make the absorption of nutrients slower
Correct Answer: C
Rationale: A large surface area, due to villi and microvilli, enhances nutrient absorption efficiency.