Biology CLEP Prep Practice Exam

What is the primary function of the digestive system?

1. Absorbing nutrients

2. Producing enzymes

3. Removing waste

4. Secretion of hormones

The correct answer is: Absorbing nutrients

The primary function of the digestive system is to absorb nutrients from the food we eat and deliver them to the body for energy and growth. While enzymes, hormones, and waste removal are all important functions of the digestive system, they are secondary to the main purpose of absorbing nutrients. Enzymes help break down food, hormones regulate digestion, and waste is removed as a byproduct of the digestive process. However, without the absorption of nutrients, our bodies would not receive the necessary fuel and building blocks for survival and growth. Therefore, A is the correct choice and the other options are not the primary function of the digestive system.