This edition: Blood, the Lymphatic System & Immunity
Blood is the fluid of life—all of our systems depend on the transportation of oxygen, hormones, nutrients, and wastes. Blood transports oxygen from the lungs to body tissues and carbon dioxide from body tissues to the lungs. Blood carries nourishment from the digestive system and hormones from glands throughout the body. It transports disease-fighting substances to the tissues and waste to the kidneys and lungs.
The lymphatic system distributes immune cells and other factors throughout the body. It also interacts with the blood and the cardiovascular system to drain fluid from cells and tissues. The lymphatic system contains immune cells that protect the body against foreign invaders.