Leukocytes are also known as what?

Leukocytes are referred to as white blood cells, which play a crucial role in the immune system. These cells are essential for defending the body against both infectious disease and foreign invaders. Unlike red blood cells, which are responsible for transporting oxygen, leukocytes are primarily involved in the body's defense mechanisms. They are produced in the bone marrow and can be found in the bloodstream and lymphatic system. The classification of leukocytes includes various types, such as lymphocytes, neutrophils, and monocytes, each serving specific functions in immune responses.

The other choices refer to different components of blood: red blood cells carry oxygen, platelets are involved in clotting, and plasma cells are a type of white blood cell that produce antibodies. Understanding the roles of different blood components is vital for grasping concepts in anatomy and physiology, particularly regarding how the body maintains homeostasis and responds to challenges.