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White blood cells are of primary importance in the Immune system.

White blood cells play a crucial role in the immune system, as they are essential for detecting and fighting off pathogens such as bacteria and viruses, thereby protecting the body against infections.

A) Immune

This option is correct because white blood cells, also known as leukocytes, are the primary defenders in the immune system. They identify, target, and neutralize foreign invaders, making them vital for maintaining the body's health and preventing diseases.

B) Respiratory

This option is incorrect. While the respiratory system is responsible for gas exchange and can be affected by infections, white blood cells are not primarily associated with its functions. The immune system, not the respiratory system, is where white blood cells exert their main influence.

C) Excretory

This option is incorrect. The excretory system is responsible for the removal of waste products from the body, and white blood cells do not play a key role in this process. Their primary function lies within the immune response, rather than waste elimination.

D) Nervous

This option is incorrect. The nervous system is responsible for transmitting signals throughout the body and coordinating responses. White blood cells do not participate in the functions of the nervous system, which involves neurons and neurotransmitters rather than immune responses.

Conclusion

The immune system is fundamentally reliant on white blood cells to carry out its protective functions, making option A the only correct choice. The other options incorrectly attribute the role of white blood cells to systems where they do not play a significant role, thereby confirming the importance of the immune system in this context.