What substances do capillaries take to the cells of the body?

Capillaries deliver essential substances to the cells of the body, including oxygen, nutrients (such as glucose and amino acids), and hormones. These substances diffuse from the blood in the capillaries into the surrounding tissues, allowing cells to perform vital functions. Additionally, capillaries help remove waste products, like carbon dioxide and urea, from the cells and transport them back to the bloodstream for excretion.