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Mammalian Nutrition - Explain the role of longitudinal and circular muscle in the stomach and small intestines.(

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Biology - Mammalian Nutrition Explain the role of longitudinal and circular muscle in the stomach and small intestines.(6) In the stomach the muscle tissue helps to churn the foods and acids up. This helps move the food get digested quicker as it moves it around, exposing more of the food to acids and enzymes. Sphincter muscles are required both at the bottom of the stomach to stop food proceeding onto the next part of the journey, and also at the top so that acid (or, less importantly, food) ...read more.


The circular and longitudinal muscles contact behind a package of food which then squeezes that bit into the next little bit of the intestine. Describe the role of the nervous system and hormones in controlling the secretion of saliva, gastric juice and pancreatic juice.(12) Nervous System Hormone (endocrine system) Saliva Stimulus both to the smell and taste receptors stimulates a reflex controlled by the medulla oblongata which directly affects the increased production of saliva by the goblet cells. ...read more.


This allows there to be a lot of gastric juice ready in the stomach when the food gets there so it can be broken down fast. Pancreatic Juice Pancreatic juice is produced, of course, in the pancreas by exocrine cells. These cells are stimulated to produce by the hormone secretin. The secretin is produced by the lining of the duodenum when the pH of the lining changes. The secretin, once produced is then taken away in the blood where it eventually meets its target audience, the pancreas. Make a diagram to summarise what happens to cellulose in a cow's rumen and reticulum.(6) ...read more.

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