Asked in Needs a Topic
Needs a Topic
What are nuetrophils?
We need you to answer this question!
If you know the answer to this question, please register to join our limited beta program and start the conversation right now!
Asked in Human and Animal Interaction, Genetics
What are the most active phagocytic cells found in circulation blood?
Surgical Pathology report consist of sheets of decidua cells infiltrated by moderate number of segmented nuetrophils or acute deciduitis?
Cells in the immune system?
The immune system is generally split into two branches the innate and adaptive immune systems. The innate side, which responds quickly to tissue injury and infection, is made up of proteins found in the blood and cells. These cells are nuetrophils, eosinophils, basophils, mast cells, macrophages and dendritic cells. Recent work has also shown that other cells types not normally thought of as being "immune cells" such as epithelial cells have important immune functions. The cells of the adaptive immune response are those that respond to infections much later and are responsible for protection from repeated infections. These include T cells and B cells. These cells will be turned on by the innate immune system, then divide and attack whatever they are specific for.
How does a healthy immune system respond when it is infected by a bacteria?
In very general terms, the immune system will recognize the bacteria as foreign (i.e. not "self") and will mobilize itself to destroy the invaders. There are many ways that the immune system responds to infections. The first line of defense are physical barriers (skin and the lining of lungs and digestive tract). This serves a variety of functions, mainly to block the entry of bacteria. The second line is the so called innate immune response (natural immunity). This powerful force is responsible for identifying the infection, moving in to do its best to eliminate the infection, and to alert the rest of the immune system that something is wrong. It will do this through a variety of mechanisms. There are too many cell types for them all to be discussed here. For bacterial infections the main players are nuetrophils (what everyone thinks of as white blood cells), macrophages (literally this means big eaters), and dendritic cells (DCs). Nuetrophils are the kamikazes of your body. They charge in and attack, eat and kill everything that they see as not you, naturally this is a messy affair. Macrophages and DCs move in next to help kill the invaders, alert the rest of your immune system that something is wrong, and to start cleaning up the mess. Most of the time your innate response is enough to eliminate the invader, but it does not have the ability to remember what its seen before. This is where your adaptive immune response comes in (you can call this acquired immunity). This part of your immune system is why vaccines work, and why its hard for you to get the same infection twice. This response is much more targeted than the natural response and therefore when you get infected with the same bug a second time you really don't feel all that sick. This response is composed of T cells (helper and killer) and B cells (the guys that produce antibodies). For a better description of each of these parts look at Wikipedia, or head to your local library