As a group describe the adventure of the indicated nutrient for your snack the t

Question

As a group describe the adventure of the indicated nutrient for your snack the the time it enters your mouth until it is broken down, absorbed and reaches the liver. Include the different places it will pass through, the types of mechanical digestion, transport, enzymes and breakdown products-all the details yo think of. Have one person write the list and be prepared to share with the class. Chex Mix-carbohydrates What happens in... Mouth Pharynx/Esophagus Stomach Duodenum Jejunum Cells lining jejunum Capillaries or lymphatics in jejunum How is it transported in blood? How does it reach liver (name blood vessels +/- lymphatics)? What does the liver do with it?

Explanation / Answer

In mouth food is chewed and broken into smaller particles and by the same time saliva is mixed with the food. Saliva contains an enzyme called salivary amylase. It breaks down polysaccharides and oligosaccharides into monemeric sugars such as dextrins and maltose.

Now food enters into the pharynx and esophagus. In pharynx food swallowing takes place now it enters the esophagus. Esophagus moves food downward towards stomach through muscular contraction. This downward movement of food is called peristalsis.Before entering the stomach there is a muscular valve between stomach and esophagus which prevents stomach acid from entering esophagus.

Now in stomach no further digestion takes place it only mixes the food and makes chyme( uniform mixture of food particles) through peristalsis.

Now the food is called chyme. It enters small intestine or duodenum where pancreatic amylase, lactase, sucrase, maltase breaks the carbohydrate into monosaccharide ( single sugar)

Jejunum is also a part of small intestine it lies after duodenum. It performs the role of absorption of digested food. For this it has a specialised cell lining called villi( finger like projections). The finger like structure of villi increases its surface area thereby faciliates absorption. Then absorbed sugar enters blood stream through cappilaries. Actually absorption requires energy Glucose and glactose is absorbed by sodium co transport and fructose is through faciliated diffusion.

The absorbed nutrients rich blood is carried to the liver by hepatic portal vein.

The absorbed Glucose, Fructose and Galactose goes to liver and makes glucose a from glycogen an fructose. Now with this glucose liver can store as glycogen( through glycogenesis) or transport to the body depending on hormonal control.

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