Digestive System Essay

The human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into.

Human Digestive System - Enchanted. Learning. com. Advertisement. Enchanted. Learning. As a bonus, site members have access to a banner- ad- free version of the site, with print- friendly pages. Click here to learn more.(Already a member? Writing An Interview Essay Sample. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste.

Many microbes (bacteria like Bacteroides, Lactobacillus acidophilus, Escherichia coli, and Klebsiella) in the large intestine help in the digestion process. The first part of the large intestine is called the cecum (the appendix is connected to the cecum).

Label Digestive System Diagram Printout (simple version)Advertisement. Enchanted. Learning. As a bonus, site members have access to a banner- ad- free version of the site, with print- friendly pages.

Digestive System Essay Conclusion

The Process Essay The process pattern of organization is especially importantin scientific writing. For example, it is used to describe biological processessuch as T. Understand the human digestive system, all its parts and functions. Study the mouth, esophagus, stomach, liver, gallbladder, pancreas and intestines. The Human Digestive System explained, function and organs. Digestive system diagram to label and colour in.

Click here to learn more.

Steps to a Healthy Oklahoma 5. Liver/GallBladder—Atthispoint,ourfoodishitwithmorechemicals. Thelivermakesachemicalcalledbile,anditisstoredinthegallbladder. The digestive system breaks down the food you eat. Learn how in this article for kids. Mercola’s Digestive Enzymes has the right mix of powerful enzymes to help break down your food and give you better digestive function.*. Essays On Gender Disorder on this page.

Free digestive system Essays and Papers. Your search returned over 4. Sample Of A Rough Draft Essay Example read more.

The Digestive System. How different are intracellular and extracellular digestion? Ways To Introduce Yourself In An Essay here. What is the evolutionary advantage of extracellular digestion? During intracellular digestion, the breaking down of macromolecules takes place within the cell. Report Example Essay Writing. Exploratory Essay Definition Pdf'>Exploratory Essay Definition Pdf. During extracellular digestion, macromolecules are broken down in places outside the cell (in the extracellular space, in the surrounding area, in the lumen of digestive tracts, etc.)The evolutionary development of extracellular digestion allowed organisms to benefit from a greater variety of foods. The breaking down of larger molecules into smaller ones outside the cell permitted the use of other foods that, due the size of their molecules, could not be interiorized by diffusion, phagocytosis or pinocytosis.

How is extracellular digestion related to cell and tissue specialization? A variety of specialized cells and tissues appeared as a result of extracellular digestion to provide enzymes and special structures for the breaking down of dietary macromolecules.

This phenomenon allowed other cells to be used for other tasks and differentiations while benefiting from nutrients distributed via circulation. Complete Digestive Systems. What is the difference between a complete digestive system and an incomplete digestive system?

How are these types of digestive systems related (or not) to extracellular digestion? Animals with an incomplete digestive system are those in which the digestive tract has only one opening (cnidarians, platyhelminthes). Animals with a complete digestive system are those in which the digestive tract has two openings, a mouth and an anus (including all other animal phyla, with the exception of poriferans, which do not have any digestive tract). In animals with incomplete digestive tracts, digestion is mixed. It begins in the extracellular space and finishes in the intracellular space. In animals with complete digestive systems, extracellular digestion within the digestive tract predominates.

What are some of the evolutionary advantages among animals with a complete digestive tract? A complete digestive tract allows animals to continuously feed without waiting for waste to be eliminated before beginning to digest new foods. In this way, the absorption of larger amounts of nutrients is possible and therefore bigger and more complex species can develop. Digestive tracts with two openings also make digestion more efficient, since they provide different sites with different physical and chemical conditions (mouth, stomach, bowels) for the action of different complementary digestive enzyme systems. Select any question to share it on FB or Twitter. Just select (or double- click) a question to share.

Challenge your Facebook and Twitter friends. Mechanical Digestion. What is mechanical digestion? In general, in molluscs, arthropods, earthworms, birds and vertebrates, which organs are involved in this type of digestion? Mechanical digestion is the fragmentation of food aided by specialized physical structures, such as teeth, prior to extracellular digestion. The mechanical fragmentation of food helps digestive enzyme reactions, because it provides a larger total area for the contact between enzymes and their substrates.

In some molluscs, mechanical fragmentation is carried out by the radula (a tooth- like structure). Some arthropods, such as lobsters and dragonflies, have mouthparts that carry out the mechanical digestion of food. In earthworms and birds, mechanical digestion is carried out by an internal muscular organ. In mandibulate vertebrates, mandibles and chewing muscles exist to triturate food prior to chemical digestion. Chemical Digestion. Concerning extracellular digestion, what is meant by chemical digestion? Chemical digestion is the series of enzymatic reactions used to break down macromolecules into smaller ones.

Which type of chemical reaction is the breaking down of macromolecules into smaller ones that occurs during digestion? What are the enzymes that participate in this process called? The reactions of extracellular digestion are hydrolysis reactions; or rather, the breaking down of molecules with the help of water. The enzymes that participate in digestion are hydrolytic enzymes. Human Digestive Tissues and Organs. Which organs of the body are part of the human digestive system?

The digestive system, also known as “systema digestorium”, or the gastrointestinal system, is composed of the digestive tract organs plus the digestive adnexal glands. The digestive tract is composed of the mouth, pharynx, esophagus, stomach, small intestine (duodenum, jejunum, ileum), large intestine (caecum, colon, rectum) and anus. What are peristaltic movements? What is their role in human digestion?

Peristalsis is the process of synchronized contractions of the muscular wall of the digestive tract. Peristaltic movements may occur starting at the esophagus up until and including the bowels. Peristaltic movements are involuntary and they have the function of moving and mixing food along the digestive tube.

Peristaltic movement deficiency (in the event of injuries of the innervation of the muscular wall of the digestive tract caused by Chagas’ disease, for example) can lead to the interruption of food traffic inside the bowels, leading to severe clinical consequences such as megacolon (abnormal enlargement of the colon) and megaesophagus (enlargement of the esophagus). From the lumen to the external surface, what tissues form the digestive tract wall? From the internal surface to the external surface, the digestive tract wall is made of mucosa (epithelial tissue responsible for intestinal absorption), submucosa (connective tissue beneath the mucous membrane where blood, lymphatic vessels and neural fibers are located), muscle layers (smooth muscle tissue, two layers, one interior circular layer and another exterior longitudinal layer, structures responsible for peristaltic movements), and the serous membrane (epithelial and connective tissue which form the external surface of the organ). In the bowels, the serous membrane extends to form the mesentery, a serosa that encloses blood vessels and supports the bowels within the abdominal cavity. The Mouth and Salivary Glands. Where are salivary glands located in humans?

There are 6 major salivary glands in humans, one of which located in each parotid gland, two beneath the jaws (submandibular) and two at the base of the tongue (sublingual). More than 7. 00 other minor salivary glands exist dispersed on the lip mucosa, gums, palate and pharynx. What is the approximate p. H of saliva secretion? Is it an acidic or alkaline fluid?

What are the main functions of saliva? The p. H of saliva is approximately 6. Therefore, it is a slightly acidic p.

H. Saliva lubricates the food and starts its enzymatic extracellular digestion. It also works as a buffer for the p. H of the mouth, as well as plays an important role in protecting the body against pathogens, due to the presence of Ig. A antibodies in it (also present in tears, the colostrum, mother’s milk and in the mucosae of the intestine and airways). What digestive enzyme is contained in saliva? Which type of food does it digest and into which smaller molecules does it break down the food?

Salivary hydrolase is known as salivary amylase, or ptyalin. Ptyalin digests carbohydrates by breaking down starch and glycogen, glucose polymers, into maltose (a glucose disaccharide) and dextrin. The Esophagus. 15. Why doesn't food enter the trachea instead the esophagus? When food is swallowed, the swallow reflex is activated and the larynx elevates and closes to stop food particles from entering the trachea, preventing the aspiration of foreign materials into the bronchi. Digestive System Review - Image Diversity: esophagus. Quotes On Albert Einstein.

Is the esophagus a muscular organ? Why can food reach the stomach even if someone is lying down flat on a bed? The esophagus is a predominantly muscular organ. It is a muscular tube, which consists of striated muscle tissue in its upper third, mixed muscle tissue (striated and smooth) in its middle third and smooth muscle tissue in its lower third. The peristalsis of the esophagus causes the food to move towards the stomach even without the help of gravity. The Stomach. 17. What route does ingested food follow, from the time of swallowing until it reaches the duodenum? Until reaching the duodenum, food enters the mouth, passes through the pharynx, goes down the esophagus and passes through the stomach.

What is the valve that separates the stomach from the esophagus called? What is its function?

The valve that separates the stomach from the esophagus is called the cardia. It has the function of preventing the acidic contents of the stomach from entering back the esophagus once again.

The improper functioning of this valve causes gastroesophageal reflux, a disease in which patients complain of bloating and heartburn (retrosternal burning). Digestive System Review - Image Diversity: stomach. What is the valve that separates the duodenum from the stomach called? Essays Writing Services read more. What is its function? The valve that separates the stomach from the duodenum is the pylorus. It has the function of keeping food within the gastric cavity for enough time to allow gastric digestion to take place. It also has the function of preventing intestinal contents from going back into the stomach.

What is the p. H inside the stomach? Why is it necessary to maintain that p. H level? What cells produce that p. H? The normal p. H of gastric juice is around 2. Therefore, it is an acidic p. H. It is necessary for the gastric p. H to be maintained acidic for the transformation of pepsinogen (a proenzyme secreted by gastric chief cells) into pepsin, the digestive enzyme that acts only under low p.

Hs. This p. H level is attained through the secretion of hydrochloric acid (HCl) by parietal cells. Besides being necessary for the activation of the main gastric digestive enzyme, how is HCl directly involved in digestion?