Digestive System

THE DIGESTIVE SYSTEM

The food taken into our mouth requires some kind of alteration before they can be absorbed into the blood stream. Digestion is the process by which food molecules are broken down into various small substances that can be absorbed into the blood stream and assimilated into the cells for utilization. Digestion is mainly a chemical process brought about by the action of many enzymes. The whole process of digestion takes place in the ALIMENTARY CANAL, which takes place in four major sections that is, the mouth, stomach, duodenum and small intestine. The mouth: In the mouth, the food is mixed and softened with the saliva secreted by many enzymes and masticated and crushed into smaller particles by the teeth. Saliva contains mucin which lubricates the food and makes swallowing easier, it also provides an alkaline medium necessary for the action of ptyalin, an enzyme. The stomach contains gastric juice which… Read More »THE DIGESTIVE SYSTEM

ANATOMY AND PHYSIOLOGY OF FARM ANIMALS

DIGESTIVE SYSTEM Digestive system and digestion Digestion in ruminant (polygastric) animals Digestion in non-ruminant (monogastric) animals Digestion in poultry birds Differences between monogastric and polygastric animals. DIGESTIVE SYSTEM AND DIGESTION The digestive system of farm animals includes all the organs and tissues associated with the breaking down or digestion of food in the body. It includes the teeth or beak, tongue, the alimentary canal or digestive tract and all the associated gland secreting enzymes and other body fluids. Digestion is the breakdown of foods substances in the digestive tract into absorbable forms. This process starts from the mouth through mastication which increases the surface area and allows microbes to have quicker access to act the food substances. Farm animals are grouped into two main classes based on the nature of the alimentary canal or digestive tract. There are polygastric (ruminant) animals and monogastric (non – ruminant) animals. … Read More »ANATOMY AND PHYSIOLOGY OF FARM ANIMALS

Digestive system

The human digestive system is a series of organs that converts food into essential nutrients that are absorbed into the body. The digestive organs also move waste material out of the body. The enzymes in saliva help break down foods, and the lubrication function of saliva makes it easier for food to be swallowed. PARTS OF THE DIGESTIVE SYSTEM Stomach Small intestine Pancreas Liver Gallbladder Colon (large intestine) Rectum Anus FUNCTIONS OF THE DIGESTIVE SYSTEM The function of the digestive system is to break down the foods you eat, release their nutrients, and absorb those nutrients into the body Diagram of the digestive system Strategies & Activities: Step: Teacher revises the previous topic. Step 2: Teacher introduces the new topic. Step3: Teacher explains the new topic. Step4: Teacher welcomes pupils’ questions. Step5: Teacher evaluates the pupils. Assessment & Evaluation: .1. Say the meaning of digestive system… Read More »Digestive system

DIGESTIVE SYSTEM

PARTS OF THE DIGESTIVE SYSTEM The digestive system consists of the alimentary canal, which is a long tube from the mouth, attached to various organs and ends at the anus. The alimentary canal is a long tube through which food substances pass, become digested (broken down), partly absorbed and the rest passed out. The alimentary canal has five main parts: (i) The mouth (ii) The gullet (or Oesophagus) (iii) The stomach (iv) The small intestine (v) The large intestine. THE HUMAN ALIMENTARY CANAL It comprises three prominent structures for digestion namely the teeth, salivary glands and the tongue.THE MOUTH TEETH: Structures for food mastication. SALIVARY GLANDS: Secrete SALIVA (A digestive juice) TONGUE: Organ of taste. THE GULLET It is also known as the Oesophagus. It is lined with smooth involuntary muscles by which contraction of food from the mouth is regulated into the stomach by PERISTALSIS. Peristalsis is the motion… Read More »DIGESTIVE SYSTEM

DIGESTIVE SYSTEM AND DIGESTION IN HUMANS

DIGESTIVE SYSTEM AND DIGESTION IN HUMANS Organs that are involved with feeding in humans constitute the digestive system Digestive System and Associated Glands Human digestive system starts at the mouth and ends at the anus. This is the alimentary canal. Digestion takes place inside the lumen of the alimentary canal. The epithelial wall that faces the lumen has mucus glands (goblet cells). These secrete mucus that lubricate food and prevent the wall from being digested by digestive enzymes. Present at specific regions are glands that secrete digestive enzymes. The liver and pancreas are organs that are closely associated with the alimentary canal. Their secretions get into the lumen and assist in digestions Digestive system consists of: Mouth Oesophagus Stomach Small intestines – consist of duodenum, the first part next to the stomach, ileum – the last part that ends up in a vestigial caecum and appendix which are non¬functional Large… Read More »DIGESTIVE SYSTEM AND DIGESTION IN HUMANS