 Well, we are discussing animal form and function two or Is a module may will be discussing digestion in the oral cavity? It's a belly. I'm not oral cavity codeca oral cavity, which is the first part where digestion occurs of the GI track so It's a oral cavity. Just say I'm not already discussed. Okay, the the front that is the mouth opening It's the bill cool opposite to it. There is the pharynx the opening again Sides join cheeks and the roof of the oral cavity. That is the hard palate and The lower that is below the tongue so This module may we will be discussing a what type of digestion? That occurs. Oh, yeah, what is a function? What are the functions of this oral cavity? This can that first there is a selection of food Then there is a grinding or mastication of food than the lubrication and Lastly digestion process So selection of food selection of food may it is a tongue which plays a very important role Now this is supplemented by other sense organs. Yes, he eyes hair nose hair smell If it is good to taste if it is good to look at and then And if it is good to tell that is that is smell So then we start grinding it or you're grinding a process to that is brought about by the teeth Which are said to be the cheek teeth in cheek teeth mean the premolars or molars at the or it's a bad lubrication a lubrication and Digestion lubrication means okay That is mixed the food that is mixed up with the mucous or mucous Kasia the that is produced by the mucous glands which are Which are located in different regions or what has a deduct is the mouth cavity can the open So yeah, first just say I'm up on one by one. We take it up Your food is selected that is by senses of smell sight and then the taste Grinding When there are big pieces, they are converted into smaller pieces As compared to its volume, so easily it is it is a grind it is chewed so that you're smaller pieces or It's the door of your heart so that he easily engulfed by Is a pharynx miss a pass or do see what you have it's got surface area But I take a enzymes kill you and times keep penetration kill you Zyada surface male guy to digest that particle or the piece or smaller chunk into smaller Into into its components So after selection food is ground by means of a molar teeth into smaller pieces Now this is useful because ease of haggis which is Which is the which is the cube to which food passes down and opens into the stomach the ease of haggis allows only smaller pieces to pass through and Smaller pieces have much more surface for the enzymes to enter Then the lubrication and digestion now these are the chief functions of The oral cavity is that which is accomplished is accomplished which is completed by saliva Now saliva is this is a secreted by three pairs of first library glance Which are its location here at a sublingual that is below the tongue sub-magazinry that is behind the jaws and and Parotate which are in front of the ears. He parotate glancy Just may when they are get infected or or mums or Joe cake you might be knowing that is mums disease Which is a viral disease or bacterial disease make one rather viral disease So this live off which is produced by these glands they contain Water and mucous mucous. What is something which is very slimy or that serves to moisten and and and Lubricate food lubrication. This is lily oiling. It is a cheese Agar jab cheese, but a lot of rough. It is the oiling key. That's why yeah, yeah Joe a bolus or food. It is it is First lubricated. It is lubricated and this lubrication is by the buccas Now sodium bicarbonate or which is which which acts as a buffer chemical in mouth Or Muxry yeah, okay. It's key pH go maintain right now. Okay. I'm Marie food Mukhli for some key Mukhli for some a key which alkaline food would be a good acidic food. Okay So Jeff I'm got the hands go to school. It is Point they let me talk to you and Zimes Joe get island hair my laser was a heat or paste food q But I could say the pH is kept maintained Or yeah, Joe key pH has about six point five or seven point five You make a food is acidic food is a basic that is almost and the neutral point me Now when enzyme, lysosine and thiocyanoid ions that kills microorganisms, HClH is very less, but has root and this is sufficient to kill the microorganisms. Because whatever food we take, clean it as much as possible, some bacteria still remain. Spores or bacteria can come, only the spores get eliminated by these chemicals. But most of them are resistant, so bacteria are killed by these thiocyanoid ions and then the enzyme, there is lysosine. Carbohydrate digesting enzyme, the most important enzyme where we call it digestion process is in the oral cavity. So the enzyme that is called mylase, which is also called as Tylen, for the initiation of the carbohydrate digestion. And the digestion starts from carbohydrates, the digestion of carbohydrates starts in the mouth and the major part of our food is usually starches. So these starches, they are converted into maltose, maltose which is called disaccharide and when starches are usually polysaccharides. So glycogen, glycogen is animal starch, it also starts to be digested in maltose. So fresh saliva is alkaline, with pH there is about 8. But then it is then adjusted with the elimination of carbon dioxide and gets the pH 6. Your 6.5, in this much pH, the enzymes we mentioned, mylase and Tylen, that is that X best at this pH. And it all depends on how long we keep that food in our mouth. So the more we chew it, the better it gets. So that our next digestion process gets facilitated there. If we engulf it without chewing, the next digestion will have to work more. So this is all about the functions of moral cavity. So this is all about.