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Description : Digestive System Anatomy and Physiology of Animals

Tags : digestive,Digestive System,Digestive System of Animal,Animal Digestive System,Digestion

Published on : Nov 19, 2023 | Views : 1325 | Downloads : 0

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Digestive System
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Pharynx Esophagus Liver Spleen Stomach Small Intestine Cecum Large Intestine Duodenum
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Large Intestine Small Intestine Pharynx Esophagus Duodenum Ileum Jejunum Cecum Colon Rectum Stomach
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Large Intestine Small Intestine Ruminant Stomach Rumen Abomasum Omasum Reticulum Esophagus
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The epithelial layer of the gastrointestinal tract is the innermost layer. It is in direct contact with the contents of the digestive tract, and it plays a vital role in digestion, absorption, and immune function. Protection: The epithelial layer protects the underlying tissues of the gastrointestinal tract from damage by physical, chemical, and biological agents. Absorption: The epithelial layer absorbs nutrients and water from the contents of the gastrointestinal tract. Secretion: The epithelial layer secretes a variety of substances, including enzymes, hormones, and mucus. Immunity: The epithelial layer plays a major role in the immune system by producing a variety of immune molecules and serving as a barrier to infection. The epithelial layer of the gastrointestinal tract is folded and contains many villi and microvilli. These folds and projections increase the surface area, which allows for more efficient absorption of nutrients and water. The muscular layer of the gastrointestinal tract is made up of two layers of smooth muscle, an inner circular layer and an outer longitudinal layer. The smooth muscle cells in these layers are arranged in a spiral pattern, which allows the muscles to contract and relax in a coordinated fashion. The muscular layer is responsible for the movement of food and fluids through the gastrointestinal tract. The circular muscles contract to narrow the lumen of the tract, while the longitudinal muscles contract to shorten the tract. This peristaltic movement helps to propel food and fluids through the gastrointestinal tract and mix them with digestive enzymes and other secretions. The muscular layer also plays a role in the absorption of nutrients and water. The contraction of the smooth muscle cells helps to massage the contents of the gastrointestinal tract against the intestinal wall, which promotes the absorption of nutrients and water. Epithelial and Muscle Layers Of The Gastrointestinal Tract Epithelial Layer Muscular Layer
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Terminology Peristalsis: A series of wave-like muscle contractions that move food and fluids through the digestive system. It starts in the esophagus when you swallow and continues through your stomach and intestines while you digest. Segmentation: A series of rhythmic contractions of the circular muscles of the digestive tract that mix the contents of the tract and propel them forward. Volatile Fatty Acid (VFA): Produced by the fermentation of carbohydrates in the rumen by bacteria. VFAs are absorbed into the bloodstream through the rumen wall and are transported to the liver. The liver then converts the VFAs into glucose, which is used by the body for energy. Rumination: Process of regurgitating and re-chewing food that has already been partially digested. It is a common behavior in ruminant animals, such as cows, sheep, and goats. Rumination allows ruminant animals to extract more nutrients from their food. Aborally: Means “away from the mouth or opening of a structure” Apical: Term for describing the pointed end of an organ or structure. Hypsodont: Refers to the structure of teeth as having short crowns and long roots. Hypsodont dentition allows herbivores to chew and grind their food more effectively.
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Terminology Aradicular Hypsodont: Teeth that have open roots and long crowns. This type of dentition is found in herbivores, such as rabbits, rodents, and horses. Aradicular hypsodont teeth grow continuously throughout the animal's life, which helps to compensate for the wear and tear caused by a diet of tough plant material. Brachydont: Term used to describe teeth that have short crowns and short roots. This type of dentition is found in omnivores and carnivores. Brachydont teeth are well-suited for tearing and shearing meat. Buccal Cavity: Known as the oral cavity or mouth. It is the space at the beginning of the alimentary canal. Carnassial Teeth: Modified molars that allow carnivorous animals to shear meat more effectively, which helps them extract more nutrients from their food. Carnassial teeth are also important for defense. They can be used to inflict serious injuries on prey or predators. Deciduous Teeth: Known as primary teeth, baby teeth, or milk teeth. They are the first set of teeth that humans and other mammals develop. They are typically lost and then replaced by permanent teeth. Dentin: Calcified tissue that makes up the majority of a tooth. It is located beneath the enamel and surrounds the pulp cavity. It helps to support the enamel, protect the pulp cavity, and transmit sensations from the tooth to the brain. Emesis: Ejection of the contents of the stomach through the mouth. (Vomiting) Enamel: Hard outer layer of the crown. It helps to protect the tooth from decay, wear, and tear.
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Terminology Enteric: Means "of or relating to the intestines" Enterohepatic Circulation: Process by which bile acids are secreted from the liver into the bile, stored in the gallbladder, and released into the small intestine, where they are absorbed back into the bloodstream and returned to the liver. EHC is an important process for the digestion and absorption of fats and other nutrients. Gastric: Means "of or relating to the stomach" Heterodont Teeth: Teeth in the mouth that have different shapes and sizes and are adapted for different functions. Found in most mammals, including humans. Humans have four different types of heterodont teeth: incisors, canines, premolars, and molars. Labial Surface: Surface of a tooth that faces the lips. Parietal Cell: Specialized epithelial cells in the stomach that produce hydrochloric acid (HCl) and intrinsic factor. HCl is a strong acid that helps to break down food and kill bacteria. Intrinsic factor is a glycoprotein that helps to bind and absorb vitamin B12 in the small intestine. Plication: Folds that increase surface area in the intestines, which aids in digestion and absorption of nutrients. Radicular Hypsodont: Tooth that grows for most of the life of the animal, but eventually the root apex closes and tooth growth ceases.
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Functions Of The Digestive System The digestive system has five main functions: Ingestion: Taking in food and liquids. Digestion: Breaking down food into smaller molecules that can be absorbed by the body. Absorption: Taking up nutrients from the digested food and into the bloodstream. Metabolism: Using the nutrients to produce energy, build new cells, and repair damaged ones. Excretion: Getting rid of waste products from the body. The mouth uses teeth and saliva to break down food into smaller pieces. The stomach uses acids and enzymes to break down food even further. The small intestine absorbs nutrients from the digested food into the bloodstream. The large intestine absorbs water from the digested food and stores waste products. The liver produces bile, which helps to break down fats. The pancreas produces enzymes that help to digest carbohydrates, proteins, and fats.
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Alveolar Bone Gum Tissue Pulp Cavity Dentin Blood Vessels Enamel Crown Root Apex
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Enzymes Amylase: An enzyme that breaks down carbohydrates into smaller molecules, such as maltose and glucose. It is produced in the salivary glands and pancreas, and it is released into the digestive tract where it helps to digest starches. Lipase: An enzyme that breaks down fats into smaller molecules, such as fatty acids and glycerol. It is produced in the pancreas and released into the small intestine, where it helps to digest dietary fats. Gastrin: A hormone that helps regulate the production of stomach acid, stimulate the contraction of the stomach muscles, relax the pyloric sphincter, stimulate the growth of the stomach lining, and inhibit the absorption of fat. It also helps to prevent bacterial overgrowth in the small intestine, improve the absorption of iron, and regulate appetite. Pepsin: Helps digest proteins, protect against bacteria, regulate gastric acid secretion, prevent food poisoning, improve nutrient absorption, and regulate stomach emptying. (Breaks down proteins into smaller peptides and amino acids) Pepsinogen: Produced by chief cells in the stomach and secreted in an inactive form. Once pepsinogen enters the stomach lumen, it is activated by gastric acid and is converted into pepsin. Pepsinogen helps protect the stomach lining, regulate pepsin activity, and regulate appetite. Prostaglandins: Regulate gastric acid secretion, protect the stomach lining, promote the healing of stomach ulcers, regulate intestinal motility, and reduce inflammation.
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Enzymes Mucin: Protects the epithelial cells from damage, lubricates the passage of food, traps and binds pathogens, and regulates a variety of other processes. Bicarbonate: Helps neutralize stomach acid, protect the lining of the stomach and small intestine, regulate the pH of the digestive tract, promote the growth of beneficial bacteria, and aid in digestion. Secretin: Hormone produced by S cells in the duodenum. It is released into the bloodstream when food enters the small intestine. Secretin regulates gastric acid secretion, stimulates pancreatic bicarbonate and bile secretion, inhibits gastric emptying, and promotes the growth of the small intestine. These effects help to protect the digestive tract, promote digestion, and improve nutrient absorption. Cholecystokinin: Hormone that is produced by I cells in the duodenum and jejunum. Stimulates gallbladder contraction, pancreatic enzyme secretion, inhibits gastric emptying, and induces satiety. These effects help to break down foods, promote digestion, and prevent overeating. Proteases: Breaks down proteins, promotes the growth of beneficial bacteria, protects the gut from harmful bacteria, reduces inflammation, and regulates blood sugar levels. These effects help to improve digestion, absorption, and gut health.
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Rumen Reticulum Rumen Omasum Abomasum Small Intestine Esophagus
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Ruminant Stomach Fermentation Of Food: The rumen is a fermentation vat where bacteria and protozoa break down plant material into smaller molecules, such as volatile fatty acids (VFAs), amino acids, and vitamins. VFAs are the main source of energy for ruminants. Storage Of Food: The rumen can store up to 40 gallons of food material. This allows ruminants to eat large amounts of food at one time and then slowly digest it over time. Absorption Of Nutrients: The rumen absorbs nutrients, such as VFAs, amino acids, and vitamins, from the fermented food material. Passage Of Food: The rumen controls the passage of food from the esophagus to the reticulum. This helps to ensure that the food is properly fermented before it passes into the reticulum. Storage Of Food: The reticulum stores food that has been regurgitated from the rumen. This allows the animal to chew and rechew the food more thoroughly. Mixing Of Food: The reticulum mixes the food with saliva and other digestive fluids. This helps to break down the food and make it more digestible. Absorption Of Water And Minerals: The reticulum absorbs water and minerals from the food. This helps to keep the animal hydrated and to maintain its electrolyte balance. Passage Of Food: The reticulum controls the passage of food from the rumen to the omasum. Rumen Reticulum
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Ruminant Stomach Acidification: The abomasum produces hydrochloric acid, which lowers the pH of the stomach contents. This helps to kill bacteria and denature proteins. Protein Digestion: The abomasum produces pepsin, an enzyme that breaks down proteins into smaller peptides. Fat Digestion: The abomasum produces lipase, an enzyme that breaks down fats into smaller fatty acids and glycerol. Nutrient Absorption: The abomasum absorbs some nutrients, such as water, electrolytes, and some vitamins and minerals. Passage Of Food: The abomasum controls the passage of food from the stomach into the small intestine. Absorption Of Water: The omasum absorbs a significant amount of water from the ingesta. This helps to keep the ruminant hydrated. Absorption Of Electrolytes: The omasum absorbs electrolytes, such as sodium, potassium, and chloride, from the ingesta. This helps to maintain the ruminant's electrolyte balance. Absorption Of VFAs: The omasum absorbs VFAs from the ingesta. VFAs are produced by bacteria in the rumen and are an important source of energy for ruminants. Passage Of Food: The omasum controls the passage of ingesta from the reticulum to the abomasum. This helps to ensure that the ingesta is properly digested before it passes into the abomasum. Abomasum Omasum
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Six Categories Of Nutrients 1) Carbohydrates are the body's main source of energy. They are found in foods such as bread, pasta, rice, potatoes, and fruits. 2) Proteins are used to build and repair tissues. They are found in foods such as meat, poultry, fish, eggs, dairy products, and legumes. 3) Fats are a source of energy and are also used to build and repair cell membranes. They are found in foods such as oils, nuts, seeds, and avocados. 6) Water makes up about 60% of your body weight and is essential for all bodily functions. It is important to drink plenty of fluids throughout the day, especially when you are active. 5) Minerals are also essential for many bodily functions, such as bone health, blood pressure regulation, and nerve function. They are found in a variety of foods, including dairy products, leafy green vegetables, and nuts. 4) Vitamins are essential for many bodily functions, such as metabolism, vision, and immunity. They are found in a variety of foods, including fruits, vegetables, and whole grains.
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Clinical Application Veterinary technicians need to be familiar with a variety of issues that can affect the digestive system of animals. These issues can range from mild to severe and can have a significant impact on an animal's health and well-being. Some of the most common issues that vet techs need to be aware of include: Digestive Tract Obstruction: Condition in which something blocks the passage of food and other materials through the digestive tract. Obstructions can be caused by a variety of factors, including foreign bodies, tumors, and parasites. Diarrhea: Condition characterized by loose, watery stools. Diarrhea can be caused by a variety of factors, including infections, dietary issues, and stress. Vomiting: Forcible expulsion of stomach contents through the mouth. Vomiting can be caused by a variety of factors, including infections, dietary issues, and toxins. Constipation: Condition in which it is difficult or impossible to pass stool. Constipation can be caused by a variety of factors, including dehydration, dietary issues, and pain. Anal Gland Impaction: Condition in which the anal glands become blocked with secretions. Anal gland impaction can be caused by a variety of factors, including dietary issues, allergies, and stress. Pancreatitis: Inflammation of the pancreas. Pancreatitis can be caused by a variety of factors, including dietary issues, infections, and trauma. Inflammatory bowel disease (IBD): Chronic condition that causes inflammation of the digestive tract. IBD is caused by a variety of factors, including allergies, infections, and immune system disorders. Liver disease: Condition that affects the liver. Liver disease can be caused by a variety of factors, including infections, toxins, and cancer.