Immune system
Videos
The immune system is a network of biological systems that protects an organism from diseases. It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as well
A scanning electron microscope image of a single neutrophil (yellow/right), engulfing anthrax bacteria (orange/left) – scale bar is 5 μm (false color)
A scanning electron microscope image of normal circulating human blood. One can see red blood cells, several knobby white blood cells, including lymphocytes, a monocyte, and a neutrophil, and many small disc-shaped platelets.
An antibody is made up of two heavy chains and two light chains. The unique variable region allows an antibody to recognize its matching antigen.
Four neutrophils in a Giemsa-stained blood film
Adaptive immune system
Videos
The adaptive immune system, also known as the acquired immune system or specific immune system, is a subsystem of the immune system that is composed of specialized cells, organs, and processes that el
A scanning electron microscope image of a single human lymphocyte