Which function is properly matched with the lymphatic organ responsible? Tonsils; removes old and damaged blood cells from the blood
Peyer's patches; contains B cells that initiate a humoral response against pathogens Spleen; found in the back of the throat and fight infection
Thymus; houses immature lymphocytes that mature into T cells

Mason joined the water polo team at his school. as part of his conditioning, mason's coach requires a 25-minute run during practice. mason's heart rate reaches 125 beats per minute, but his target heart rate zone is 138—183 beats per minute. what should mason do to get the most benefit for his heart? increase the amount of time he runs increase the speed at which he runs decrease the amount of time he runs decrease the speed at which he runs