Nokea
Which of the following combinations will lead to the highest level of acid secretion through potentiation? (Potentiation refers to a post-receptor interaction where the response obtained is greater than the sum of each individual agent acting alone.)
- A. Vagal input, histamine, gastrin
- B. Vagal input, histamine, secretin
- C. Histamine, gastrin, secretin
- D. Gastrin, vagal input, secretin
Correct Answer: A
Rationale: Vagal input, histamine, and gastrin all stimulate parietal cells synergistically (potentiation), maximizing acid secretion, while secretin inhibits it.
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Removal of waste from body in the form of undigested food is called
- A. Digestion
- B. Absorption
- C. Assimilation
- D. Egestion
Correct Answer: D
Rationale: Egestion is the removal of undigested waste from the body.
The break down products of fat molecules can pass directly through the cell membrane. Why?
- A. Fats are soluble in the membrane because the membrane is made of phospholipids
- B. Fats pass through via a protein pump
- C. Fats pass through via a protein channel
- D. Fats are transported through with a special device called a transporter
Correct Answer: A
Rationale: Fat breakdown products (fatty acids and glycerol) are lipid-soluble and can diffuse through the phospholipid bilayer of cell membranes.
Adenoids are enlarged:
- A. Palatine tonsil
- B. Pharyngeal tonsil
- C. Lingual tonsil
- D. Laryngeal tonsil
Correct Answer: B
Rationale: Adenoids refer to the enlarged pharyngeal tonsil, located in the nasopharynx, which can obstruct breathing when hypertrophied.
The glucose is converted into glycogen in liver and stored in :
- A. Liver
- B. Liver and muscles
- C. Liver and spleen
- D. Spleen and muscles
Correct Answer: B
Rationale: Glucose is stored as glycogen in both the liver and skeletal muscles.
Which juice secreted by the organs in the alimentary canal plays an important role in the digestion of fats?
- A. Pancreatic juice
- B. Saliva
- C. Bile juice
- D. Hydrochloric acid
Correct Answer: C
Rationale: Bile juice, secreted by the liver, plays an important role in the digestion of fats by emulsifying them. It does not contain enzymes but helps break down fat molecules into smaller droplets for further digestion.