Leukocyte- Literally means "White cell" A leukocyte fights off microorganisms. They make up less than 1% of the blood however, it is the largest ranging anywhere from 9-12 μm. It is a solid.
Erythrocyte- Literally means " Red cell" A erythrocyte transports oxygen. There are 5.2 billion per mL of blood. They have a 120 day life span. 7-8 μm. Solid Carries hemoglobin
Thrombocyte- Literally means "Clotting cell" A thrombocyte helps blood clot. Thrombocytes are really small 1-2 μm. Solid.
Plasma- Literally means "Flat cell" They are 90% water making them a liquid. 2-4 μm. Helps maintain homeostasis.