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Sistema imunitário. Um neutrófilo (a amarelo) envolve uma bactéria de antraz (a laranja), numa imagem obtida através de microscópio eletrónico de varrimento. O sistema imunitário, sistema imunológico ou ainda sistema imune é um sistema de estruturas e processos biológicos que protegem o organismo contra doenças.
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, from viruses to parasitic worms, as well as cancer cells and objects such as wood splinters, distinguishing them from the organism's own healthy tissue.
The study of the molecular and cellular components that comprise the immune system, including their function and interaction, is the central science of immunology. The immune system has been divided into a more primitive innate immune system and, in vertebrates, an acquired or adaptive immune system.
Immunity (medicine) In biology, immunity is the state of being insusceptible or resistant to a noxious agent or process, especially a pathogen or infectious disease. Immunity may occur naturally or be produced by prior exposure or immunization .
Há 1 dia · Immune system, the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing entities. Immunity from disease is conferred by two cooperative defense systems: innate immunity and acquired immunity.
The immune system is the set of tissues which work together to resist infections. The immune mechanisms help an organism identify a pathogen, and neutralize its threat. The immune system can detect and identify many different kinds of disease agents. Examples are viruses, bacteria and parasites.
The innate immune system is an alternate defense strategy and is the dominant immune system response found in plants, fungi, prokaryotes, and invertebrates (see Beyond vertebrates). The major functions of the innate immune system are to: recruit immune cells to infection sites by producing chemical factors, including chemical ...
