Final answer:
The primary site of blood cell production is in the red bone marrow of the skeletal system, which is involved in the process known as hematopoiesis. Granulocytes are a type of leukocyte, significant in the immune system's initial response to infection.
Step-by-step explanation:
The primary site of blood cell production is within the skeletal system. Answer to the student's question is option B) skeletal system. Blood cell production, also known as hematopoiesis, mainly occurs in the red bone marrow, a component of the skeletal system. Hematopoiesis is the process by which all of the cells of the blood and the immune response develop from hematopoietic stem cells. The production of these cells includes erythrocytes, leukocytes (which include granulocytes), and platelets. Specifically, granulocytes, which are a type of white blood cell, fall under the category of leukocytes.
Granulocytes are indeed a type of leukocyte, which is the correct answer to the second part of the student's question. Specifically, granulocytes are categorized as either neutrophils, eosinophils, or basophils and are part of the immune system's first line of defense against infections. Therefore, for question 11, the correct answer is D) leukocyte.