Final answer:
Nutrients and energy-rich molecules from digested food are transported to cells via the digestive and cardiovascular systems, with the lymphatic system also playing a role in lipid absorption. Digestion begins with mechanical and chemical processes, and absorption occurs mainly in the small intestine where nutrients enter the bloodstream or lymphatic system.
D is correct
Step-by-step explanation:
The nutrients and energy-rich molecules are transported to our cells through a collaborative effort of several systems, chiefly the digestive system, the cardiovascular system, and the lymphatic system. After food is consumed, it undergoes two types of digestion - mechanical and chemical. The former breaks food into smaller pieces, beginning in the mouth and continuing in the stomach, whereas the latter breaks down food molecules into small nutrient molecules and begins with saliva in the mouth and continues with stomach enzymes.
The absorption of these nutrients mostly occurs in the small intestine, where they pass into the blood vessels lining the intestine to enter the bloodstream. In the case of lipids, the glycerol and fatty acids are absorbed into the lymphatic system before being released into the bloodstream. After absorption, the nutrients are circulated to all the cells for energy production and cellular functions. Meanwhile, waste products and non-absorbed materials pass through the large intestine for excretion, facilitated by the excretory system.