Final answer:
The absorption of nutrients occurs primarily in the small intestine, where most nutrients are absorbed into the bloodstream through the epithelial cells that make up the mucosa. Lipids are absorbed into lacteals and are transported to the bloodstream via the lymphatic vessels.
Step-by-step explanation:
Food that has been broken down is of no value to the body unless it enters the bloodstream and its nutrients are put to work. This occurs through the process of absorption, which takes place primarily within the small intestine. There, most nutrients are absorbed from the lumen of the alimentary canal into the bloodstream through the epithelial cells that make up the mucosa. Lipids are absorbed into lacteals and are transported via the lymphatic vessels to the bloodstream (the subclavian veins near the heart). The details of these processes will be discussed later.