Propulsion and Mixing of Food in Alimentary Tract


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Lecture´s Description

This physiology medical V leaning lecture is devoted towards the elucidation of propulsion and mixing of food in the alimentary tract. Our medical specialist, Dr Danial Qasim has comprehensively discussed about ingestion, peristalsis along with the anatomy of stomach. In addition to this, vasovagal reflex, motor functions and mixing of stomach in conjunction with the movements of small intestine and colon, autonomic reflexes and defection has been elaborated.

In this video lecture, educator introduces the concept of ingestion and how food passes different parts of digestive system including mouth, oesophagus, stomach, small intestine and large intestine.

The pharyngeal stage of swallowing is involuntary, passage of food from pharynx into esophagus. Peristalsis is worm like movement by which the alimentary canal or other tubular organs propel their contents. There is esophageal primary and secondary peristaltic movement passes down the food to stomach and in when primary peristaltic movement fails respectively.

In the next section, Educator describes the anatomy of stomach, its different parts and how food is digested in stomach. Storage and mixing of food and emptying it to intestine are the motor functions of the stomach. Educator explains the process of mixing and emptying stomach. Movements of small intestine are segmentation contraction, peristaltic waves and some nervous and hormonal signals from brain.

Large intestine consists of many parts with varying functions. Movements of colon can be contractions, mass movement or through reflexes.

Defecation is the final act of digestion, by which organisms eliminate solid, semisolid, or liquid waste material from the digestive tract via the anus.

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