Human Body Systems

What type of digestion takes place in the stomach?

• mechanical

• chemical

• both mechanical and chemical

Answer explanation

In the stomach, both mechanical and chemical digestion occur. Mechanical digestion involves the churning of food, while chemical digestion involves enzymes and acids breaking down food into nutrients.

Where does the process of digestion begin?

• mouth

• esophagus

• stomach

• small intestine

Answer explanation

The process of digestion begins in the mouth, where food is mechanically broken down by chewing and mixed with saliva, which contains enzymes that start the chemical digestion of carbohydrates.

Where does the absorption of nutrients from food take place?

• stomach

• liver

• small intestine

• large intestine

Answer explanation

The absorption of nutrients from food primarily occurs in the small intestine, where digested food is absorbed into the bloodstream. The stomach mainly breaks down food, while the liver and intestines have different roles.

What chemically breaks down food into smaller molecules?

• teeth

• muscles of the stomach

• enzymes

Answer explanation

Enzymes are biological catalysts that chemically break down food into smaller molecules, facilitating digestion. While teeth and stomach muscles aid in the physical breakdown, enzymes are essential for the chemical process.

In the process of digestion, the _________________ acts like a sponge, squeezing water out of the food we eat and absorbing it into our bloodstream.

• esophagus

• stomach

• small intestine

• large intestine

Answer explanation

In digestion, the large intestine absorbs water from food, acting like a sponge. It removes excess water, helping to form solid waste, while the esophagus, stomach, and small intestine primarily focus on food breakdown and nutrient absorption.

Reorder the following. Put these in order that food follows as it passes through the digestive system.

• mouth

• small intestine

• esophagus

• stomach

• large intestine

The _____ makes food into a liquid.

• esophagus

• water

• stomach

Answer explanation

The stomach is responsible for breaking down food into a liquid form through the action of its acids and enzymes, making it the correct answer. The esophagus transports food, while water is not a digestive organ.

Tags

NGSS.MS-LS1-7

The intestines take the _____ from the food.

• nutrients

• tongue

• teeth

Answer explanation

The intestines absorb nutrients from food, which are essential for the body's energy and growth. The tongue and teeth are involved in the initial stages of digestion, but they do not extract nutrients.

Tags

NGSS.MS-LS1-7

The _____ brings food from the mouth to the stomach.

• esophagus

• mouth

• stomach

Answer explanation

The esophagus is the tube that connects the mouth to the stomach, transporting food after it is swallowed. The mouth is where food enters, and the stomach is where food is digested, but the esophagus is the correct answer for this function.

Liquid from the stomach goes into the _____.

• food

• esophagus

• intestines

Answer explanation

Liquid from the stomach, known as chyme, moves into the intestines for further digestion and nutrient absorption. The esophagus is the tube that carries food to the stomach, not where stomach liquid goes.

Tags

NGSS.MS-LS1-7