"Immune" System
Sponges do not have the complex immune systems of most other animals. However they reject grafts from other species but accept them from other members of their own species. In a few marine species, gray cells play the leading role in rejection of foreign material. When invaded, they produce a chemical that stops movement of other cells in the affected area, thus preventing the intruder from using the sponge's internal transport systems. If the intrusion persists, the grey cells concentrate in the area and release toxins that kill all cells in the area. The "immune" system can stay in this activated state for up to three weeks.
Read more about this topic: Sponge, Vital Functions
Other articles related to "immune system, immune":
... Lipopolysaccharides trigger the immune system to produce proinflammatory cytokines IL-1, IL-6, and tumor necrosis factor (TNF) ... psychosocial stress enhances the ability of an immune response to trigger both inflammation and behavioral sickness ...
... Immune mediated hemolytic anemia (direct Coombs test is positive) Autoimmune hemolytic anemia Warm antibody autoimmune hemolytic anemia Idiopathic Systemic lupus erythematosus (SLE) Evans' syndrome (antip ... a non-compatible blood type) Drug induced immune mediated hemolytic anemia Penicillin (high dose) Methyldopa ...
... Disease is home to the world's largest database on how the immune system responds to infectious diseases, the Immune Epitope Database and Analysis Resource (IEDB) ... to be intuitive and easily searched and to propel the dissemination of immune epitope information ...
... the discovery of an enzyme - protein kinase C theta - which may hold the key to controlling immune response ... scientists to design treatments aimed at either boosting an immune response, such as to fight cancer, or to suppress an unwanted immune attack on normal cells, which occurs in autoimmune disease ...
... The receptor is expressed on immune cells where it binds to MHC class I molecules on antigen-presenting cells and transduces a negative signal that inhibits ... It is thought to control inflammatory responses and cytotoxicity to help focus the immune response and limit autoreactivity ...
Famous quotes containing the words immune system, system and/or immune:
“The moral immune system of this country has been weakened and attacked, and the AIDS virus is the perfect metaphor for it. The malignant neglect of the last twelve years has led to breakdown of our country’s immune system, environmentally, culturally, politically, spiritually and physically.”
—Barbra Streisand (b. 1942)
“Each generation’s job is to question what parents accept on faith, to explore possibilities, and adapt the last generation’s system of values for a new age.”
—Frank Pittman (20th century)
“The moral immune system of this country has been weakened and attacked, and the AIDS virus is the perfect metaphor for it. The malignant neglect of the last twelve years has led to breakdown of our country’s immune system, environmentally, culturally, politically, spiritually and physically.”
—Barbra Streisand (b. 1942)