International Sports Sciences Association (ISSA) Trainer Practice Exam

What is one of the functions of the digestive system?

1. Absorption of nutrients

2. Secretion of hormones

3. Excretion

4. Production of bile

The correct answer is: Excretion

The digestive system plays a crucial role in breaking down food and facilitating the absorption of nutrients, making it essential for overall health and wellness. One of the primary functions of the digestive system is the absorption of nutrients from the food we consume. As food is digested, it is broken down into smaller molecules, such as amino acids, fatty acids, and simple sugars. These molecules are then absorbed through the walls of the intestines into the bloodstream, where they can be transported to cells throughout the body for energy, growth, and repair. The secretion of hormones, excretion, and the production of bile are also important functions in the human body but do not capture the primary role of the digestive system, which is primarily focused on nutrient absorption. While the secretion of hormones can influence digestive processes and bile aids in fat digestion, these functions support the overall digestive process rather than being the core purpose of the digestive system. Thus, the absorption of nutrients stands out as a fundamental function essential for health.