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The blood and lymphatic system

Across
Small organs composed of lymphatic tissue located along the route of the lymphatic vessels
Essential to development of immune system
The bodies ability to defend itself against pathogens
Form a network of vessels throughout the body
White blood cell
Down
Red blood cell
The study of blood
Collects excess fluid from tissues and returns them to the circulatory system
The smallest element of blood
Located on each side of the throat