* Plasma: This is the liquid part of blood, made up mostly of water but also containing dissolved substances like proteins, electrolytes, glucose, and waste products.
* Red blood cells: These cells carry oxygen throughout the body. They contain the protein hemoglobin, which binds to oxygen.
* White blood cells: These cells help fight infection and disease.
* Platelets: These small cell fragments help stop bleeding.
Because of this complex composition, it's impossible to represent blood with a single chemical formula.
