Regulation of Secretion of Gastric Juice | Nervous & Hormonal Control | Class 11 Biology New Book

Regulation of secretion of gastric juice, nervous regulation of gastric secretion, hormonal regulation of gastric secretion, cephalic phase, gastric phase, intestinal phase, gastrin hormone, digestive system class 11, biology new syllabus 2025.

regulation of gastric juice, nervous and hormonal control, gastric secretion phases, class 11 biology digestion.

The regulation of gastric juice secretion is controlled by both the nervous system and the hormonal system, ensuring that digestive secretions are released only when required. The whole process occurs in three major phases: the cephalic phase, the gastric phase, and the intestinal phase. In the cephalic phase, the parasympathetic nervous system (vagus nerve) stimulates gastric glands in response to sight, smell, taste, or even the thought of food. The gastric phase begins when food enters the stomach; here, stretch receptors and chemical receptors activate local reflexes, while the hormone gastrin is released to increase secretion of HCl and pepsinogen. The intestinal phase involves both
stimulation and inhibition depending on the chyme entering the duodenum. Hormones such as secretin and cholecystokinin (CCK) play a critical role in slowing gastric activity to allow proper intestinal digestion.

This lecture follows the Class 11 Biology New Book 2025–26 (PECTAA) and presents a complete theoretical explanation suitable for exam preparation, board questions, and conceptual clarity.

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