Digestive System

The digestive system prepares food to be

transported by the circulatory system by —

• exchanging food for oxygen

• using food to repair heart tissue

• turning food into blood cells

• breaking food small into molecules that can travel through blood vessels

Tags

NGSS.MS-LS1-7

Many different processes occur in the digestive

system. What distinguishes each process as a

chemical change?

• mixing of substances

• new substances are created

• substances move to different places

• substances are broken into smaller pieces

Which process involved in digestion is not a physical change?

• chewing

• epiglottis blocks the trachea

• saliva breaks down food

• muscles push the food down

Which of the following represents a physical change during digestion?

• Teeth crush and grind food into smaller

  fragments.

• Saliva breaks starch (carbohydrates) down

  into sugars in the mouth.

• Enzymes break down food in the small

  intestine.

• Stomach acids break down food particles

  into smaller particles.

What is the function of the mouth in the digestive system

• cut and chew food

• its where digestion starts from

• food id mixed with gastric juices

What is the function of teeth in the digestive system

• cut and chew food

• digestion starts from

• nutrients pass to blood

Where does your body get energy from ?

• food we eat

• the store

• playground

Tags

NGSS.MS-LS1-7

NGSS.MS-LS2-3

What is the primary function of the digestive system?

• A) To circulate blood throughout the body

• B) To break down food into nutrients

• C) To provide oxygen to the cells

• D) To protect the body from infections

Which organ is responsible for the absorption of nutrients?

• A) Stomach

• B) Small intestine

• C) Large intestine

• D) Esophagus

What enzyme in saliva begins the digestion of carbohydrates?

• A) Pepsin

• B) Amylase

• C) Lipase

• D) Trypsin