Topics:
Animal Physiology, Animal Refresher
Three Phases of Gastric Secretion
Three phases of gastric secretions are-
- Cephalic, Gastric & Intestinal — Correct Answer
- Reflex, Cephalic & Intestinal
- Cephalic, Reflex & Gastric
- None
Explanation:
Correct Answer: Cephalic, Gastric & Intestinal
Gastric secretion is regulated in three sequential phases named after where the stimulus originates relative to the stomach.
Three Phases in Full Detail
- 1. Cephalic Phase (Reflex Phase):
- Stimulus: Sight, smell, taste, or thought of food (brain-mediated)
- Pathway: Higher brain centers → Hypothalamus → Vagus nerve (cranial nerve X) → stomach
- Result: ~20% of total gastric secretion; stimulates HCl and pepsinogen
- Absent in herbivores/ruminants — continuous grazers have no discrete meal anticipation
- 2. Gastric Phase:
- Stimulus: Food present in stomach → distension of stomach + protein breakdown products stimulate G-cells
- G-cells secrete Gastrin → parietal cells (HCl) and chief cells (pepsinogen)
- Most important phase: ~50–60% of total gastric secretion
- 3. Intestinal Phase:
- Stimulus: Chyme in duodenum
- Mild stimulation initially; then fats/acids → CCK, Secretin, GIP → inhibit further gastric secretion (enterogastric reflex)
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
