ISSA Trainer Practice Exam 2025 – Complete Study Resource

The primary function of the digestive system is the absorption of nutrients derived from the food we consume. After food is ingested, it undergoes a series of mechanical and chemical processes in various organs, ultimately allowing the body to absorb essential nutrients such as carbohydrates, proteins, fats, vitamins, and minerals.

This process typically occurs in the small intestine, where specialized cells facilitate the transfer of these nutrients into the bloodstream. From there, they are distributed to cells throughout the body, providing the energy and building blocks necessary for growth, repair, and overall functioning. The digestive system's ability to effectively break down food and absorb nutrients is crucial for maintaining health and supporting bodily processes.

In contrast, while secretion of hormones, excretion, and production of bile are related to the function of the digestive system, they are not its primary roles. For instance, bile production is associated with the liver and aids in the digestion of fats, but the key function here is absorption, which directly relates to how the body utilizes the nutrients from food.