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READ THIS 00:00 a tunnel acts like a connection between 00:06 two points separated from each other 00:09 take these two places for example to go 00:12 from one point to the other we need 00:15 something that would connect the two and 00:17 a smooth transportation is assured by 00:20 this tunnel a similar scene is found in 00:23 our body as well our mouth or the buccal 00:26 cavity to be precise is the place where 00:28 the food is masticated that is chewed 00:31 the next immediate Junction for 00:33 digestion is the stomach and both these 00:37 important points are connected via the 00:39 single slender tube like structure 00:41 called the esophagus can we notice this 00:45 pipe here that seam connecting the 00:47 buccal cavity and the stomach well 00:49 that's the esophagus the other name for 00:53 it is the food pipe any idea how the 00:56 structure participates in digestion well 01:00 you will be surprised to know that this 01:02 part of the alimentary canal does not 01:04 help in digestion in any way yes this 01:08 narrow muscular tract has no role to 01:11 play in the digestion process so if not 01:15 digestion then what function does it 01:17 perform it serves as a passage for the 01:20 food this connection between the mouth 01:23 and the stomach heads in the 01:25 translocation of the food and not its 01:27 digestion so does the food from the 01:30 mouth travels straight down the line not 01:33 really the process is not that straight 01:36 and simple 01:38 the vaults of the oesophagus contract 01:40 and relax alternately allowing the 01:42 softball as a food to pasta this 01:46 alternate and rhythmic contraction and 01:48 relaxation of the muscles 01:49 this cult peristalsis this movement has 01:53 in propelling the food from the mouth to 01:55 the stomach 01:57 now the next organ of our interest is 02:00 the Stuber what happens when the food 02:02 reaches the stomach let's find that out 02:05 this stomach is a muscular pouch where 02:08 most of the digestion takes place it's 02:11 even referred to as the gastric gland we 02:14 know that the buccal cavity has 02:16 contributed in physical digestion by the 02:19 mastication process also the enzymes 02:22 from the saliva a gland contribute 02:24 partly in the digestion of the 02:26 carbohydrates present in the food that 02:29 means digestion commences in the mouth 02:32 so to keep it a step ahead the stomach 02:35 contributes in its own way to the 02:37 process it helps in both mechanical and 02:40 chemical digestion mechanical digestion 02:44 of the food is aided by the churning 02:46 process this happens when the muscles in 02:49 the wall of the stomach 02:50 contract and help in churning the food 02:52 within and how does the chemical 02:55 digestion occur internally the stomach 02:59 has numerous glands present in its wall 03:01 which secrete a juice called the gastric 03:04 juice it mainly consists of three major 03:07 components an acid called hydrochloric 03:10 acid mucus and an enzyme by the name 03:13 pepsin it takes up the responsibility of 03:16 partially breaking down the proteins any 03:19 idea what the other two components apart 03:22 from the pepsin enzyme are useful for 03:26 the hydrochloric acid takes care of two 03:28 things firstly it kills all the harmful 03:31 bacteria and other microbes that have 03:33 entered the system through the food and 03:36 secondly it makes sure that the enzyme 03:39 pepsin can work properly the breakdown 03:42 of proteins partially is not an easy job 03:44 for the pepsin hence it requires acidic 03:48 conditions given by hydrochloric acid to 03:50 work efficiently now tell me one thing 03:54 if there is a layer of acid secreted by 03:56 the stomach won't the inner lining or 03:59 the cells get damaged no the protection 04:02 of the inner lining of the stomach is 04:04 assured by the mucus layer the mucus 04:08 oversees protection of the stomach walls 04:10 from the harmful activity of the 04:12 hydrochloric acid it makes sure that the 04:15 cells remain undamaged so it's the 04:19 stomach where the food gets churned 04:21 thoroughly and is mixed with the gastric 04:23 juice to digest it efficiently now 04:27 before moving ahead with the next part 04:29 of the alimentary canal there is a small 04:31 thing we need to know can you notice 04:34 these small structures at the beginning 04:36 and at the end of the pouch any idea 04:39 what these are these are muscular 04:42 junctions that act like gates for 04:44 regulating the entry and the exit of the 04:46 substances in the stomach yes they known 04:49 as sphincters the upper one at the end 04:53 of the esophagus is called the cardiac 04:55 sphincter it helps in preventing the 04:58 backflow of food once it enters the 05:00 stomach 05:02 similarly the lower one also known as 05:04 the pyloric sphincter helps in 05:07 controlling the entry of the food from 05:08 the stomach in the next part of the 05:10 alimentary canal 05:13 now that we've learned about the stomach 05:15 in details let's discuss the next organ 05:18 in the alimentary canal in detail in the 05:21 next video 05:22 [Music] 05:27 you
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Hii sir I am a icse student this video helped me and I want to become a doctor so I like bio and this video helped me sir thanks a loot 😊 ☺ 😀 🙂 😄 👍 😊 ☺ 😀 🙂 😄 👍 😊 ☺ 😀 🙂 😄 👍 😊 ☺
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I m from pakistan i realllyyy like your videos i start teaching after fsc because of financial issues but yr videos really helps me to explain thank u sooo much
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