Lipids [Part 3 of 5]

Ajouté : 2026-05-21

[00:00:02]and now we will go to the major classification of lipids no so we have here four triglycerides phospholipids waxes and steroids but actually lipids are classified into more than these classifications lipids among others no but um but for this case no for our studying of lipids so let's go with them one by one one okay the first are the triglycerides and you've seen them already earlier no so triglyceride this is the most abundant type of fat or lipid that is found in the human body okay so fat cells adipose tissues okay again what they are made up of so it's made up of three fatty acids one two and three and they are bonded to the glycerol particularly on the their o group The hydroxy group over here no and the bond between these two molecules the glycerol and your fatty acid is called an Esther Bond so again we have three Esther bonds for every triglyceride okay triglyceride because TR means three and glyceride coming from the name of the glycerol okay so Three fatty acids inserted on a glycerol again bonds I Esther bonds no so triglycerides so they're actually the main constituents of vegetable oil and fats in the meat so canola oil coconut oil palm oil an Puro um triglycerides l no and then for the fats in the meat gun no but we can expect no that in the fats in the meat they solid so saturated or unsaturated fat it must be saturated solid at room temperature vegetable oil liquid at room temperature we can assume that it is made up of unsaturated fat so as you can see here this one is a straight chain thus it is a saturated fat but if you will find Kinks over here then it becomes an unsaturated fatty acid huh and um one of the functions of your triglyceride would be energy storage again it is used as an alternative like your carbohydrates no so for energy okay carbohydrates enery so triglycerides an okay the second type of lipids will be your phospholipids no and we have discussed them a lot of times already in cell transport no so they are the major component of cell membranes okay again they exist in this B layer okay so we have non polar tails that are two fatty acids so this one is a fatty acid okay this is one fatty acid over here and this is one fatty acid as you can see here fatty acid is this a saturated or an unsaturated fatty acid okay so in this case you can see a saturated fatty acid it is a straight chain of carbon atoms in the other tail this is a unsaturated fat no so mosol unsaturated so it varies phospholipids okay so fats phosphate group head okay this is a glycerol molecule okay so glycerol molecule and this one is your hydrophilic head no and interestingly of water assemble so they would produce this selectively permeable membrane okay phos groups hydrophobic groups Tails carbon chain again recall their characteristics and their interactions with water hydrophilic it is attracted to water okay so phosphate group or water molecules no whereas for for your hydrophobic Tails your fatty acids hydrophobic so so in this by layer your hydrophobic Tails face each other no while your phosphate groups are facing always the water no this is the extracellular space toig it's a fluid the Lumin of the cell is also filled with water thus attracted phosphate groups again your phospholipids will form this Bayer that will form the boundary between the cells and its environment okay