Outline the three stages in the extraction of energy from food. What type of chemical reaction o

Outline the three stages in the extraction of energy from...

Key Concepts

Digestion

This is the process by which complex food molecules are broken down into simpler components. It involves both mechanical processes, such as chewing, and chemical processes, where enzymes catalyze reactions (primarily hydrolysis) to split large molecules into smaller, more manageable units.

Absorption and Assimilation

After breakdown, the simpler molecules are absorbed through the walls of the digestive tract into the bloodstream. Once absorbed, these nutrients are assimilated by cells for use in various metabolic activities, providing the raw materials for energy production and cellular repair.

Cellular Respiration

In this stage, cells oxidize the absorbed nutrients to extract chemical energy. Through a series of metabolic pathways, such as glycolysis, the citric acid cycle, and the electron transport chain, energy is captured in the form of ATP, which is then used to power cellular functions.

Hydrolysis

This is the chemical reaction most often occurring during digestion, in which water molecules are used to break the bonds of complex macromolecules. Hydrolysis reactions are essential for converting large, indigestible food components into smaller, absorbable molecules that can be further metabolized for energy.

Transcript

00:01 So digestion is the breakdown of food in your stomach and in your small intestine.

00:07 So mostly what you're breaking down are carbs, triglycerides, and protein.

00:12 Those are the three big classes.

00:15 So let's go over each one and then we'll get to the chemical event that is happening during digestion to break these things down.

00:26 So the bonds in carbs are glycositic bonds.

00:34 Glycocytic.

00:36 And they occur between two sugars.

00:38 So, for instance, two glucose is bound together will form amortose.

00:48 So these glycosidic bonds are actually, they can be called acetyl or hemicetyl.

00:58 Functional groups, depending on if the sugar is reducing or non -reducing.

01:06 The most important part, though, is that these, in order to break the bond, we're adding water.

01:14 So the chemical event happening in order to break these carbs down is high hydrolysis.

01:25 Great.

01:28 Triglycerides, oh, sorry.

01:30 Triglycerides are made of, so a glycerolesterol backbone, in fact, fatty acid tails.

01:35 So we break these down and we use the glycerol and then we use the fatty acids and we can also just store triglycerides.

01:43 So the bonds don't have any specific names like a glycic bond, but they are just called ester bonds.

01:56 And so obviously the functional group involved with the bonds of a triglycerol, triglyceride are in ester.

02:04 And so you can see that here.

02:05 So say this is our backbone of our glycerol, and then we're going to have an o here, and then our fatty acid chain.

02:21 We're going to have a double bond here for each fatty acid tail...

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