Disease
Disease that can be spread from person to person
Communicable disease
Microscopic organism; also called microbe
Microorganism
Thick, sticky fluid that traps pathogens; produced by mucous membranes
Mucus
Fluid that surrounds cells; keeps cells clean and balanced with liquid
Tissue fluid
Part of the immune system that collects tissue fluid and cleans the body of pathogens
Lymphatic system
Tissue fluid that has been forced into lymph vessels
Lymph
Disease that cannot be spread from person to person
Microorganism that can cause disease; a germ
Pathogen
The body's ability to resist and protect itself against infectious diseases
Immunity
Increased blood flow caused by histamine; makes the tissue become red, swollen, and tender
Inflammation
The smallest vessels of the lymphatic system
Lymph capillaries
A transportation vessel for lymph
Lymph vessel
The condition of having too much body fat
Obesity
Single-celled microorganism that does not have a cell nucleus
Bacterium
Y-shaped molecules made by lymphocytes to help protect the body from disease and infection
Antibodies
Hair-like projections that keep pathogens from getting into the lungs
Cilia
Large bunches of lymphatic tissue located throughout the body
Lymph nodes
Largest organ of the lymphatic system; cleanses the blood
Spleen
Disease caused by the uncontrolled growth of body cells
Cancer
Pathogen much smaller than a bacterium; reproduces by using a host cell of the body
Virus
White blood cells that find, surround, and destroy pathogens
Phagocytes
Chemical messenger that triggers inflammation
Histamine
A group of lymph nodes at the back of the throat
Tonsils
Lymphatic organ that prepares lymphocytes to fight pathogens
Thymus
Disease that causes extra sugar to collect in the blood
Diabetes mellitus
Animal that can carry a pathogen and transmit it to humans
Vector
White blood cells that recognize and attack invading pathogens, produce antibodies, and can become memory cells
Lymphocytes
Special enzyme found in tears that can kill bacteria
Lysozyme
A group of lymph nodes at the back of the nose
Adenoids
Groups of lymph nodes in the walls of the small intestine
Peyer's patches