Praxis 5511 Practice Test Practice Question
White blood cells are of primary importance in which of the following systems?
Correct Answer: A
Rationale: White blood cells, or leukocytes, play a crucial role in the immune system, defending the body against infections and foreign invaders. They identify, target, and eliminate pathogens, making them essential for maintaining health.
The respiratory system primarily facilitates gas exchange and does not directly involve white blood cells in its core functions. The excretory system focuses on waste removal and fluid balance, while the nervous system is responsible for transmitting signals and coordinating body functions. Thus, options B, C, and D do not directly relate to the primary function of white blood cells.
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