Blood is composed of several elements, each with unique histological characteristics. Red blood cells (erythrocytes) are biconcave and lack nuclei, optimizing them for oxygen transport. White blood cells (leukocytes) come in various types, including neutrophils, lymphocytes, and monocytes, each with distinct histological features that enable immune functions. Platelets (thrombocytes) are small, anucleate cell fragments critical for blood clotting. Plasma, the liquid component, contains water, proteins, electrolytes, and nutrients.
