The Digestive System

What is a tissue?

A group of cells with a similar structure and function.

What defines an organ?

An organ is a group of tissues working together for a specific function.

Give an example of an organ.

The stomach, which contains muscle and glandular tissue.

What is an organ system?

A group of organs that work together to form an organism.

What are the three main nutrients found in food?

Carbohydrates, proteins, and lipids (fats).

What process breaks down large food molecules into smaller molecules?

Digestion.

What does the saliva in the mouth do?

Begins to digest starch into smaller sugar molecules.

What function does hydrochloric acid serve in the stomach?

It helps enzymes digest proteins.

What does the pancreas release into the small intestine?

Enzymes that continue digestion of starch, proteins, and begin digestion of lipids.

What is the role of bile in digestion?

It helps to speed up the digestion of lipids and neutralizes stomach acid.

How are small food molecules absorbed in the small intestine?

By diffusion or active transport.

What happens in the large intestine?

Water is absorbed into the bloodstream, and feces is released from the body.

How are the products of digestion used by the body?

To build new carbohydrates, lipids, and proteins; some glucose is used in respiration.