U2: Metabolism- Body Build Digestive System

What is digestion?

• The breakdown of food and the absorption of nutrients

• The movement of air in and out of the lungs

• The mixing of blood and oxygen in the heart

• The production of hormones in glands

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What is the difference between physical and chemical digestion?

• Chemical digestion uses chemicals and enzymes, while physical digestion involves teeth and muscles

• Physical digestion uses enzymes, while chemical digestion relies only on chewing

• Chemical digestion happens only in the mouth, while physical digestion happens only in the stomach

• Physical digestion changes molecules, while chemical digestion changes the shape of organs

What is the function of the small intestine?

• Most digestion occurs here and nutrients are absorbed

• Stores food before digestion begins

• Reabsorbs water from undigested food

• Produces bile

Based on the diagram showing amylase acting on starch, which product is formed?

• Maltose

• Glucose

• Lactose

• Sucrose

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What is the name of the process by which food moves through the alimentary canal?

• Peristalsis

• Diffusion

• Osmosis

• Respiration

What is a catalyst?

• A substance that speeds up a chemical reaction without being used up

• A molecule that stops all reactions

• A type of digestive organ

• A nutrient used for energy

What is the function of the stomach?

• Stores and churns food, starting digestion

• Absorbs most nutrients

• Produces insulin

• Reabsorbs water

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NGSS.MS-LS1-7

What is the function of the large intestine?

• Reabsorbs water

• Starts digestion by churning food

• Produces digestive enzymes

• Absorbs most nutrients

Which procedure best shows the action of amylase on starch using a simple test?

• Add amylase to starch, keep the mixture at 37°C for 10 minutes, then test for a reducing sugar with Benedict’s solution; a red color indicates maltose is present

• Boil starch for 10 minutes at 100°C and test with iodine; a blue‑black color shows starch remains

• Add water to starch at room temperature and test with Biuret solution; a purple color indicates protein

• Add amylase to protein at 0°C and test with Benedict’s solution; a red color indicates sugar

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

What is the function of the liver?

• Produces bile and helps detoxify the body

• Absorbs digested nutrients

• Pumps blood through the body

• Breaks food by chewing