Nutrients and Digestion
Food is fuel and building material, but your body cannot use it until it is broken down into pieces small enough to absorb. That job belongs to digestion. Knowing the main nutrients and the basic steps of digestion answers a whole set of biology questions and explains why a balanced diet matters. This lesson covers […]
Lymphatic System and Prevention
Working quietly alongside the blood is a second network of vessels: the lymphatic system. It drains extra fluid, filters out germs, and helps the body defend itself. It gets less attention than the heart or lungs, but its role in immunity and prevention makes it worth knowing. This lesson explains the lymphatic system and how […]
