Semmelweis Medicine Biology Entrance Practice Exam

For food molecules to be absorbed into the body, they must pass into capillaries or villi. This process occurs primarily in the small intestine where the structure is specifically adapted for nutrient absorption. Villi are tiny, finger-like projections that increase the surface area of the intestinal lining, allowing for a more efficient uptake of nutrients into the bloodstream.

Once the food is digested into its simplest forms, such as amino acids, fatty acids, and simple sugars, these molecules are absorbed through the walls of the villi. From there, they enter the capillaries, which are small blood vessels that transport nutrients throughout the body. This process is crucial for supplying the body with the necessary energy and building blocks needed for growth, repair, and maintenance.

While the other options mention forms and states of food molecules, they are not necessary conditions for absorption. The ability to pass into capillaries or villi is fundamental to the absorption process itself.