Final answer:
A normal platelet count is between 150,000 and 400,000 platelets per cubic millimeter of blood, ruling out the other options provided.
Step-by-step explanation:
A normal platelet count ranges between 150,000 and 400,000 platelets per cubic millimeter of blood. Platelets, or thrombocytes, are crucial components of the blood-clotting system. They are cell fragments that are important for blood coagulation and repair of damaged blood vessels. Although platelets are small in size, measuring about 2-4 µm in diameter, they are numerous in the bloodstream. A significant portion of them are stored in the spleen and released when needed to respond to vascular injury.
Normal platelet counts are an important indicator of a person's overall health, and both low and high counts can lead to health issues. The specific option that correctly matches the normal range of platelets is the second one, indicating 130,000 to 360,000, although the actual range extends slightly beyond that.