Which cells are the primary components of the human immune system?

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Red blood cells

White blood cells

Muscle cells

Bone cells

answer is B.

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Detailed Solution

White blood cells, also known as leukocytes, are the primary components of the human immune system. These cells are produced in the bone marrow and are an essential part of the lymphatic system.

White blood cells can move freely throughout the body, including blood and tissues, to detect and respond to foreign invaders such as bacteria, viruses, parasites, and fungi. There are several types of white blood cells, each with a unique function in the immune system.

For example, lymphocytes are a type of white blood cell that produce antibodies and help to recognize and destroy invading pathogens.

Hence, the correct option is white blood cells.

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