Blood delivers several essential substances to every part of the body:
- Oxygen : Carried by red blood cells from the lungs to all body cells, where it is needed for metabolism
- Nutrients : Including glucose, amino acids, vitamins, minerals, and fatty acids absorbed from digestion, transported through the bloodstream to cells for energy and growth
- Hormones : Secreted by endocrine glands and carried by blood to target organs and tissues to regulate bodily functions
In addition to delivery, blood also transports waste products like carbon dioxide from cells to the lungs for exhalation and other wastes to the kidneys and liver for elimination
. Thus, blood acts as a transport system delivering oxygen, nutrients, and hormones to every part of the body while removing waste products to maintain homeostasis and support cellular function
