What term refers to white blood cells that constitute 5-10k cells per microliter?

The term that refers to white blood cells is "leukocytes." These cells play a crucial role in the immune system, helping to defend the body against infections and foreign invaders. The normal range for leukocyte count in a healthy adult is approximately 5,000 to 10,000 cells per microliter of blood, which aligns with the information provided in the question.

Erythrocytes, on the other hand, are red blood cells responsible for transporting oxygen throughout the body and do not fall within the count range specified. Neutrophils are a specific type of leukocyte, the most abundant, but they only make up a portion of the total leukocyte count and do not represent the entire category. Platelets are involved in blood clotting and also do not relate to white blood cells. Thus, "leukocytes" correctly identifies the full set of white blood cells, encompassing various types that work together to maintain immune function.