PSI Barbering Practice Exam

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The spleen is part of what body system?

Lymphatic/immune system
Circulatory system
Muscular system
Respiratory system

The correct answer is: Lymphatic/immune system

The spleen is an integral component of the lymphatic and immune systems. Its primary role involves filtering blood, recycling iron, and serving as a reservoir for blood. As part of the immune system, it plays a crucial role in responding to infections by producing lymphocytes, which are vital for immune defenses, and by filtering out old or damaged red blood cells. While the spleen does have roles that may intersect with the circulatory system—since it filters blood and can affect blood volume—it is specifically classified as part of the lymphatic/immune system due to its primary functions related to the immune response and lymphatic fluid circulation. The other body systems listed, such as muscular and respiratory systems, do not encompass the spleen's primary functions or roles within the organism.