Final answer:
The spleen is composed of a large number of tightly-packed lymphocytes and is responsible for combatting and preventing circulatory infections. It contains numerous lymphocytes that combat and prevent circulatory infections by killing and removing pathogens from the blood.
Step-by-step explanation:
The organ that is composed of a large number of tightly-packed lymphocytes is the spleen. The spleen is a major secondary lymphoid organ located in the upper left quadrant of the abdomen near the stomach. It contains numerous lymphocytes that combat and prevent circulatory infections by killing and removing pathogens from the blood.
The spleen is composed of a large number of tightly-packed lymphocytes and is responsible for combatting and preventing circulatory infections. It contains numerous lymphocytes that combat and prevent circulatory infections by killing and removing pathogens from the blood.