Human Digestive System - Science Learning 2

Practice Human Digestive System questions with answers. This prep guide includes questions like, what is our body made up of?, how are small molecules transported?, why large molecules cannot absorb into blood?, how long is digestive tract?, how can large molecules pass through digestive tract? and others below.

Human Digestive System Learning 2

Question: What is our body made up of?

Answer: Our body is made up of different molecules, but the molecules found in carbohydrates, fats and proteins are large so they are broken down.

Question: How are small molecules transported?

Answer: Small molecules are absorbed into the blood streams which deliver these small molecules to the destinations where they are required within the body.

Question: Why large molecules cannot absorb into blood?

Answer: The molecules we eat are large, thus it is impossible for them to get diffused into the blood stream without any process of digestion or break down.

Question: How long is digestive tract?

Answer: The digestive system of an average adult male is about 10 meters long, this digestive tract starts from mouth and ends up at the anus.

Question: How can large molecules pass through digestive tract?

Answer: The only way by which carbohydrates, fats and proteins can pass through the digestive tract walls is if they are broken down into smaller molecules by different processes of digestion and break down