The nephron is surrounded by capillaries. What is their name?
- A. Multitubular capillaries
- B. Unitubular capillaries
- C. Peritubular capillaries
- D. Polytubular capillaries
Correct Answer: C
Rationale: Peritubular capillaries surround the nephron, facilitating reabsorption and secretion.
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Which of the following would MOST directly affect the operations of the digestive system?
- A. osteoporosis
- B. liver damage
- C. heart attack
- D. kidney failure
Correct Answer: B
Rationale: Liver damage directly impacts digestion by reducing bile production, essential for fat breakdown.
Which statement about chemical digestion in the human alimentary canal is correct?
- A. Digestion of carbohydrates is completed in the colon.
- B. Enzymes are secreted to break down cellulose in the duodenum.
- C. Protein digestion is completed in the ileum.
- D. The stomach secretes enzymes to break down starch.
Correct Answer: C
Rationale: Protein digestion begins in the stomach with pepsin and is completed in the ileum by proteolytic enzymes from the pancreas and intestinal mucosa.
Infants' gastric juice contains
- A. Nuclease, pepsinogen, lipase
- B. Maltase, pepsinogen, rennin
- C. Amylase, rennin, pepsinogen
- D. Pepsinogen, lipase, rennin
Correct Answer: D
Rationale: Infants' gastric juice contains pepsinogen, lipase, and rennin to aid in milk digestion.
What waste does the integumentary system remove from the body?
- A. liquid waste
- B. carbon dioxide
- C. salt and water
- D. urea
Correct Answer: C
Rationale: The integumentary system, via sweat glands, removes salt and water through perspiration.
Islets of Langerhans and are found in
- A. Modified lymph glands, pancreas
- B. Ductless glands, pancreas
- C. Specialized area, pituitary
- D. Small tubules, kidney
Correct Answer: B
Rationale: Islets of Langerhans are endocrine (ductless) glands in the pancreas that secrete hormones like insulin.