Final answer:
The small intestine is indeed the primary location for nutrient absorption. It is specifically adapted for this function with a large surface area provided by villi and microvilli, which enhance its ability to absorb the products of digestion into the bloodstream.
Step-by-step explanation:
The statement that the small intestine is the primary site of absorption of nutrients is true. The small intestine, a long, narrow, tube-like organ of the digestive system, is where most chemical digestion of food and virtually all absorption of nutrients take place. Chyme moves from the stomach to the small intestine, where the digestion of protein, fats, and carbohydrates is completed. The inner surface of the small intestine is highly folded and contains millions of finger-like projections called villi, with each villus having many microscopic projections known as microvilli. These structures maximize the surface area for absorption, making it equivalent to the size of a tennis court. The vast surface area allows for the efficient uptake of digested nutrients into the bloodstream. The absorbent cells lining the small intestine—specifically within the jejunum—perform most of the nutrient absorption. These cells have projections that significantly enhance their ability to absorb food substances.