Small intestine and food absorption

The video explains the digestive system, highlighting its length and the processes of digestion and absorption. Digestion breaks down large food molecules into smaller ones, which are absorbed in the small intestine. The small intestine, with its villi, increases surface area for absorption. Nutrients like sugars, amino acids, fatty acids, and glycerol are absorbed into the bloodstream or lacteal through diffusion, moving from high to low concentration areas. This efficient system ensures nutrients are transported throughout the body.

How long is the human digestive system approximately?

• 9 meters

• 7 meters

• 5 meters

• 11 meters

What is the primary function of villi in the small intestine?

• To break down food

• To store nutrients

• To increase surface area for absorption

• To produce digestive enzymes

Which of the following is NOT absorbed into the blood capillary?

• Sugars

• Amino acids

• Fatty acids

• Glycerol

What process allows small molecules to move from the small intestine into the bloodstream?

• Diffusion

• Filtration

• Active transport

• Osmosis

Why do large molecules need to be broken down in the digestive system?

• To fit through the small intestine's holes

• To increase their nutritional value

• To make them taste better

• To change their color