- published: 06 Aug 2012
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Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma. In certain organisms, these smaller substances are absorbed through the small intestine into the blood stream. Digestion is a form of catabolism that is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The term mechanical digestion refers to the physical breakdown of large pieces of food into smaller pieces which can subsequently be accessed by digestive enzymes. In chemical digestion, enzymes break down food into the small molecules the body can use.
In the human digestive system, food enters the mouth and mechanical digestion of the food starts by the action of mastication (chewing), a form of mechanical digestion, and the wetting contact of saliva. Saliva, a liquid secreted by the salivary glands, contains salivary amylase, an enzyme which starts the digestion of starch in the food; the saliva also contains mucus, which lubricates the food, and hydrogen carbonate, which provides the ideal conditions of pH (alkaline) for amylase to work. After undergoing mastication and starch digestion, the food will be in the form of a small, round slurry mass called a bolus. It will then travel down the esophagus and into the stomach by the action of peristalsis. Gastric juice in the stomach starts protein digestion. Gastric juice mainly contains hydrochloric acid and pepsin. As these two chemicals may damage the stomach wall, mucus is secreted by the stomach, providing a slimy layer that acts as a shield against the damaging effects of the chemicals. At the same time protein digestion is occurring, mechanical mixing occurs by peristalsis, which is waves of muscular contractions that move along the stomach wall. This allows the mass of food to further mix with the digestive enzymes.
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Hank takes us through the bowels of the human digestive system and explains why it's all about surface area. Crash Course Biology is now available on DVD! http://dft.ba/-8bCC Like Crash Course? http://www.facebook.com/youtubecrashcourse Follow Crash Course: http://www.twitter.com/TheCrashCourse Table of Contents 1) Surface Area to the Max! 3:21 2) Mouth to Esophagus 5:23 3) Stomach 6:38 4) Small Intestine 7:55 5) Large Intestine 9:44 References Campbell Biology, 9th ed. http://www.sciencedaily.com/releases/2007/10/071008102334.htm crash course, biology, anatomy, digestive system, animal, development, digestive tract, nervous system, vertebrate, micro-ecology, microorganism, human, omnivore, acid, enzyme, surface area, mouth, teeth, saliva, nutrient, intestine, salivary amylase, swallo...
'The Journey of the Digestive System' National Geographic own all rights to this video
http://www.idaalearning.com/ Human beings take food through mouth and digest it in specific organs for digestion. The undigested food is defecated. The food we take passes through a specific canal which begins with buccal cavity and ends at the anus. This canal is called alimentary canal or the digestive tract.
Nachos are delicious. And versatile because today they're also going to help us learn a thing or two about your digestive system. Nachos can provide us with energy and raw materials, by first ingesting something nutritious, propelling it through the alimentary canal where it will be mechanically broken down, and chemically digested by enzymes until my cells can absorb their monomers and use them to make whatever they need. And eventually, there will be pooping. Table of Contents Ingestion 6:24 Propulsion 7:00 Mechanical Breakdown 7:38 Digestion 8:01 Absorption 8:30 Defecation 8:50 *** Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Thanks to the following Patrons for their generous monthly contributions that help keep Crash C...
This digestive system animation explains the mammalian digestive system: the structure of the alimentary canal, working and its functions. The six primary processes of the digestive system include: Ingestion of food Secretion of fluids and digestive enzymes Mixing and movement of food and wastes through the body Digestion of food into smaller pieces Absorption of nutrients Excretion of wastes Discover educational videos that are designed to be simple, interesting, fun and rigorous for K-12 curriculum. Here you will find educational content on subjects like Science, Math, History, English, Physics, Chemistry, Biology, Accounting etc. Subscribe iKenEdu channel for more Educational Videos @ www.youtube.com/ikenedu This is a product of Mexus Education Pvt. Ltd., an education innovations comp...
Watch this movie about your digestive system, the system that handles the food you eat.
These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. More free lessons at: http://www.khanacademy.org/video?v=v2V4zMx33Mc
Food goes in, then what? Find out in this movie about the Digestive System!
Visit http://www.makemegenius.com or http://www.mysciencevideos.com,best science education websites. Human digestive system starts working even before you take a bite of that yummy pizza and it keeps working even after you've finished eating. The digestion process helps your body to get the nutrients and energy it needs from the food you eat.In this educational video,kids can go through the whole digestion order in an interactive way
HOME REMEDIES FOR DIGESTION PROBLEM II अपचन की समस्या का घरेलू उपचार II In this video of F3 health care at home very extremely talented anchor Mr. Alaankar Shrivastava is giving "HOME REMEDY FOR DIGESTION PROBLEM" through all natural ingredients which gives you quick heal in all the health problems. You can watch our other informative videos in which you will get solutions of your every query with all natural ingredients. SUBSCRIBE OUR CHANNEL FOR REGULAR UPDATES: http://www.youtube.com/subscription_center?add_user=F3Tamil Like us on Facebook: www.facebook.com/F3HealthCare Follow us on Twitter: www.twitter.com/FirstFrameFilms You can also share this video on Whatsapp too. Please visit our other channels as they are fully accomplished to meet your queries in relevance with all typ...