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In crustaceans, specifically decapods such as the crayfish, the stomach is divided into two parts: the first, or anterior part is called the "gastric mill". The gastric mill is lined with chitinous teeth which grind up coarse food particles. The posterior part of the stomach acts as a filter to keep coarse particles from entering the digestive glands, where absorption takes place.
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What role does the gastric juices play digestion?
because,it breaks down and dissolve the nutrients in food..
What are gastric glands in frogs?
Gastric glands in frogs are structures located in the stomach lining that secrete digestive enzymes and hydrochloric acid to help break down food. These glands play a crucial role in the digestion process of frogs by aiding in the breakdown of food into nutrients that can be absorbed by the body.
What role do the parasympathetic division of the ans play in digestion?
The parasympathetic division of the autonomic nervous system stimulates digestion. It activates salivation, which functions in digestion as the beginning of breaking the food down. It also stimulates the gall bladder to release bile for digestion. Digestion in the small intestine is increased and gastric juice in the stomach is secreted.
What cell types make up gastric glands?
The main cell types that make up gastric glands are mucous neck cells, parietal cells, chief cells, and enteroendocrine cells. These cells work together to produce and secrete gastric juices in the stomach, which play a key role in digestion.
What is the site of pepsin production?
Pepsin is produced in the stomach, specifically by the chief cells located in the gastric glands of the gastric mucosa. It is secreted as an inactive precursor called pepsinogen, which is activated to pepsin in the presence of gastric acid (hydrochloric acid). This activation occurs in the acidic environment of the stomach, enabling pepsin to play its role in protein digestion.
What acids are in gastric juices?
Hydrochloric acid is found in gastric juices. With the high acidic levels of hydrochloric acid, it creates a harsh environment and helps to kill off most of the bacteria living in the stomach.
Is it true or false smooth muscles in the stomach are capable of mechanical digestion?
True. Smooth muscles in the stomach play a crucial role in mechanical digestion by contracting rhythmically to churn and mix the food with gastric juices. This process helps break down food into smaller particles and facilitates the enzymatic digestion that follows.
What are not important as a stimulus in the gastric phase of gastric secretion?
During the gastric phase of gastric secretion, stimuli that are not important include the presence of food in the mouth and the sight or smell of food, which primarily activate the cephalic phase. Additionally, factors like emotional stress or anxiety, while they may influence overall digestion, do not play a direct role in stimulating gastric secretion during this phase. The gastric phase mainly relies on the distension of the stomach and the presence of peptides and amino acids in the stomach.
What is gastric antral contractions?
Gastric antral contractions refer to rhythmic muscle contractions that occur in the antrum, the lower part of the stomach. These contractions help grind and mix food with digestive juices, facilitating the process of digestion and the gradual release of chyme into the small intestine. They play a crucial role in gastric motility and the overall digestive process. Abnormalities in these contractions can lead to various gastrointestinal disorders.
Is food mashed and mixed with digestive juices in the pharynx?
No, food is not mashed and mixed with digestive juices in the pharynx. The pharynx is primarily a passageway for food and air, where swallowing occurs, but it does not play a role in digestion. The actual mixing and breakdown of food with digestive juices occur in the stomach, where gastric juices aid in digestion.
What four enzymes are produced in the abomasum?
The abomasum, often referred to as the "true stomach" in ruminants, produces several key enzymes, including pepsin, rennin (or chymosin), gastric lipase, and lysozyme. Pepsin is responsible for protein digestion, while rennin aids in curdling milk in young animals. Gastric lipase helps in the digestion of fats, and lysozyme has antibacterial properties, assisting in the maintenance of gut health. These enzymes play crucial roles in the digestive process of ruminants.
Why are rugae necessary to shark digestion?
Rugae are folds in the stomach lining of sharks that increase the surface area for digestion. They help to mechanically break down food as the stomach contracts, mixing it with digestive enzymes and gastric juices. This enhances the efficiency of digestion and nutrient absorption, allowing sharks to extract maximum energy from their prey. Overall, rugae play a crucial role in the digestive process of these efficient predators.
