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In this IBDP Biology blog post, we will be looking at the function of gastric juices and where and how it is secreted in our bodies.
Gastric juice vs. Pancreatic juice
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4979856/732620_269691.png)
Similarities:
- Contain water (universal solvent)
- Contain mucus (as a lubricant or an intestinal lining)
- Contain salts and ions (calcium, phosphate, etc.)
Control of gastric juice secretion
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4979856/110542_626046.jpeg)
Pre-Ingestion
- The sight and smell of food triggers a reflex response in which gastric juice is secreted from gastric pits in the stomach wall
- This ensures that gastric juice is in the stomach by the time the food is consumed
Post-Ingestion
- Food entering the stomach causes distension, which is detected by stretch receptors in the stomach lining
- Impulses are sent to the brain, which triggers the secretion of gastrin from the pits lining the stomach wall
- Gastrin causes the sustained release of gastric juice, particularly its acid component
- When the pH drops too low, gastrin secretion is inhibited by hormones
That is it for this post!
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/4979856/241487_781228.png)
References:
https://www.google.com/url?sa=i&url=http%3A%2F%2Fwww.old-ib.bioninja.com.au%2Foptions%2Foption-h-further-human-2%2Fh2-digestion.html&psig=AOvVaw0ebcF3Tq5PQUEpmHU0oORD&ust=1627754851749000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCPjahsOxi_ICFQAAAAAdAAAAABAD
https://www.google.com/url?sa=i&url=http%3A%2F%2Fib.bioninja.com.au%2Foptions%2Foption-d-human-physiology%2Fd2-digestion%2Fgastric-secretions.html&psig=AOvVaw1KpzzLeBRgbOXNOXhKwZfR&ust=1627754913265000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCPieruaxi_ICFQAAAAAdAAAAABAg
Drafted by Venetia (Biology)