Digestive System Functions and Processes

The video explains the digestive system, highlighting its length and functions beyond digestion. It details the breakdown of food into small molecules by enzymes and bile, and the absorption of these molecules in the small intestine. The small intestine's villi increase surface area for absorption, allowing nutrients to enter the bloodstream. The process of diffusion is explained, showing how molecules move from high to low concentration. The video concludes with a call to action for viewers to engage with the content.

How long is the human digestive system approximately?

• 5 meters

• 15 meters

• 12 meters

• 9 meters

Which of the following is NOT a product of digestion?

• Starch

• Sugars

• Amino acids

• Fatty acids

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

• To transport blood

• To produce bile

• To increase surface area for absorption

• To secrete enzymes

Which vessel in the villi absorbs fatty acids and glycerol?

• Capillary

• Lacteal

• Vein

• Artery

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

What process allows small molecules to move into the blood vessels in the small intestine?

• Diffusion

• Active transport

• Filtration

• Osmosis

Which of the following moves into the blood capillary through diffusion?

• Starch

• Fatty acids

• Glycerol

• Sugars

What is the concentration gradient in the context of diffusion?

• Equal movement in both directions

• Movement from low to high concentration

• Movement from high to low concentration

• No movement

What happens to the digestive food molecules after absorption?

• They are converted into energy immediately

• They are stored in the liver

• They are transported around the body

• They are excreted

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