What is the primary function of phagocytes?

The primary function of phagocytes is to engulf foreign cells, including bacteria, viruses, and dead or dying cells, as part of the immune response. This process is known as phagocytosis, where the phagocyte surrounds and internalizes the foreign particle, allowing it to be broken down and eliminated. Phagocytes play a crucial role in protecting the body from infections and maintaining overall health by removing harmful pathogens and debris from the bloodstream and tissues.

The other functions listed are performed by different types of cells or systems in the body. For example, antibodies are produced by B lymphocytes. Regulation of blood sugar is primarily managed by hormone secretion from the pancreas. Transporting oxygen is the role of red blood cells, which contain hemoglobin to facilitate this process. Each of these functions is essential, but they are distinct from the specific role of phagocytes in immune defense.