Examlex
Shortly after Adolf Hitler signed a non-aggression pact with the Soviet Union in August 1939
Tears
A liquid produced by the lacrimal glands for lubrication, nourishment of the cornea, and protection against infection in the eye.
Macrophages
A type of white blood cell that engulfs and digests cellular debris, foreign substances, microbes, and cancer cells in a process called phagocytosis.
Lymph Nodes
Small, bean-shaped structures that produce and store cells that help fight infection and disease.
Bacteria
Microscopic, single-celled organisms found in diverse environments, capable of causing disease or contributing to health.