seven blood components that are present in blood
1 Plasma, in which the blood cells are suspended, including: 2  Red blood cells (erythrocytes) - carry oxygen from the lungs to the rest of the body. 3  White blood cells (leukocytes) - help fight infections and aid in the immune process.4  Types of white blood cells include: 5  Lymphocytes.6  Monocytes. 7  Eosinophils. Plasma, in which the blood cells are suspended, including: 2  Red blood cells (erythrocytes) - carry oxygen from the lungs to the rest of the body. 3  White blood cells (leukocytes) - help fight infections and aid in the immune process.