Final answer:
Platelets are smaller than RBCs, with a size of 2-4 micrometers compared to the average primate RBCs diameter of 7.5 micrometers.
Step-by-step explanation:
In most mammals, platelets are smaller than red blood cells (RBCs). Platelets, or thrombocytes, are cell fragments that are crucial for the blood clotting process. They have a size range from 2 to 4 micrometers in diameter, while an average primate red blood cell has a diameter of approximately 7.5 micrometers. Platelets are also more numerous than white blood cells in the circulation, with a typical concentration of 150,000 to 400,000 per microliter of blood. Erythrocytes, or red blood cells, are counted in the millions and are responsible for transporting oxygen to tissues thanks to their content of hemoglobin.