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Gland A group of cells that prepare and release a chemical for use by the body Vaccine A weakened or inactive version of a pathogen that stimulates the body's production of antibodies that can destroy the pathogen Hormone A chemical messenger released into the bloodstream that sends signals to distant cells, causing them to change their behavior in specific ways Hypothalamus Controls the pituitary gland Thyroid Produces hormones that regulate the basal metobolic rate Parathyroids Produces a hormone that destroys bone to release calcium Pituitary Produces hormones that control many of the endocrine glands Adrenal Produces cortisol, which causes the liver to release glucose into the blood Pancreas Produces insulin, which enables glucose to enter the cells Thymus Produces a hormone that stimulates the production of T-cells The lymphatic system What system fights disease? The urinary system What system regulates water balance and chemical levels in the blood? The endocrine system What system controls various functions by releasing hormones? Lymph vessels and lymph nodes What two kinds of basic structures make up the lymphatic sytem? In the lymph nodes Where is lymph cleaned, in the lymph vessels or in the lymph nodes? The lacrimal glands What gland produces tears? The B-cells, the T-cells and the macrophages What three kinds of cells in the lymph nodes fight infection? B-cells What kind of cell in the lymph nodes produce antibodies? Memory B-cells What kind of cell helps the lymphatic system "remember" an infection so that it can fight the infection better next time?