IB Biology Digestive System

Place the following events in sequence: Food enters your large intestines

• A, B, C

• C, B, A

• C, A, B

• B, A, C

Hydrochloric acid is a caustic chemical that can burn your skin- and yet it exists in your stomach. How can this be?

• Your small intestines absorb all the hydrochloric acid

• The food in your stomach absorbs all the acid

• Your stomach lining protects you against burns

• The hydrochloric acid in your stomach is different from the hydrochloric acid you would find in a chemistry lab

What is chyme?

• A particular type of digestive enzymes

• What food is called after it has been digested by the stomach

• A chemically active part of the small intestine

• The passage that leads from the small intestine to the large intestine

What might happen if you had your pancreas removed?

• Your intestines might have trouble breaking down food

• Your stomach might have trouble producing hydrochloric acid

• You would not be able to chew properly

• You would have trouble producing saliva

Which organ of the digestive system physically breaks down food by the squeezing and churning of muscular contractions?

• mouth

• stomach

• esophagus

• small intestine

The muscular tube that connects the mouth to the stomach.

• stomach

• esophagus

• large intestine

• small intestine

In which organ does most of the chemical digestion of food occur?

• small intestine

• large intestine

• stomach

• mouth

In which organ does most of the nutrient absorption occur?

• small intestine

• large intestine

• stomach

• mouth

In which organ of the digestive system are most fats broken down?

• esophagus

• stomach

• small intestine

• large intestine

Which organ is responsible for absorbing water from digested food?

• small intestine

• stomach

• large intestine

• mouth