Nokea
Crypts of Lieberkuhn are found in between the villi. They secrete :
- A. Glucagon
- B. Succus entericus
- C. Insulin
- D. Gastric juice
Correct Answer: B
Rationale: Crypts of Lieberkuhn secrete succus entericus for intestinal digestion.
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Fungiform papillae are most numerous in:
- A. Pharyngeal part of the tongue [post. 1/3rd]
- B. Oral part of the tongue
- C. Edges & tip of tongue.
- D. Basolateral area of oral part of the tongue.
Correct Answer: B
Rationale: Fungiform papillae are scattered across the oral part of the tongue but are most concentrated at the edges and tip, where taste perception is heightened.
Where in the nephron is most of the glucose reabsorbed back into the blood?
- A. Proximal convoluted tubule
- B. Distal convoluted tubule
- C. Loop of Henle
- D. Henley upon Thames
Correct Answer: A
Rationale: Most glucose is reabsorbed in the proximal convoluted tubule via active transport.
The cells of the epithelial lining in the vertebrate stomach are not damaged by HCl because of
- A. Mucus secretion covering the epithelium
- B. Neutralization of HCl by alkaline gastric juice
- C. HCl being dilute
- D. Epithelium being resistant to HCl
Correct Answer: A
Rationale: Mucus secreted by gastric cells forms a protective barrier against HCl, preventing damage to the stomach lining.
Food tests were carried out on four different substances. Which substance contained both protein and reducing sugar?
- A. substance A
- B. substance B
- C. substance C
- D. substance D
Correct Answer: A
Rationale: Substances testing positive for both the biuret test (protein) and Benedict's test (reducing sugar) indicate the presence of both protein and reducing sugars.
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.