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Immune System
This category is for questions about how our bodies identify and fight off disease, infection or pathogens through specialized cells, tissues and organs. The system that does this is called the immune system. It produces antibodies which recognize intruders and neutralizes potentially pathogenic organisms or substances.
4,548 Questions
Flagella themselves are not pathogenic as they are the whip-like appendages that some organisms use for movement. However, bacteria and other microorganisms with flagella can be pathogenic, using the flagella to navigate through their host's tissues and cause infections.
Does meiosis or mitosis occur when the immune system produces armies of defensive white blood cells?
Meiosis and mitosis are different types of cellular reproductions. Meiosis is sexual but mitosis is asexual reproduction. Meiosis and mitosis continue to occur when the immune system produces white blood cells.
How is the body's immune system able to recognize foreign bacterial cells?
Antigens are protein markers on the surface of cells and viruses that help the immune system identify a foriegn cell or virus. It serves as the first sign of detection to finding a foreign particle and triggers an immune response if it encounters or detects a pathogen.
Hope it helped! :)
Airborne pathogens are infectious agents such as bacteria, viruses, or fungi that can be transmitted through the air. They can be spread through respiratory droplets when infected individuals cough, sneeze, or talk, allowing the pathogens to be inhaled by others in close proximity. Examples include tuberculosis, influenza, and COVID-19.
No. Viruses are not living things, so they do not have an immune system. In a way, however, they can protect themselves from us by mutating their own form so that our immune system can not recognize them any more. Until our bodies learn again that they are a foreign invader in our cells and then create new cells that can destroy the new mutation of the virus, it does have a chance to safely be in our bodies. While in our cells, a virus makes our cells do its main function (which is replication of itself). The mutation that it does by changing the make up of the proteins on its capsid (outer shell) allows it to bypass our immune systems temporarily.
B lymphocytes are the white blood cells that produce plasma cells that produce antibodies. Antibodies are special proteins that recognize foreign materials and help the body destroy or neutralize them.
The type of white blood cell that secretes antibodies to kill microorganisms is called lymphocytes. The other kind of white blood cell is called the phagocyte, which kills pathogens by engulfing them (basically, "eating" the microbe).
Some leukocytes, such as neutrophils, can have segmented nuclei that appear as multiple lobes. These segmented nuclei can give the appearance of multiple nuclei when observed under a microscope. This characteristic is known as polymorphism, and it is a normal feature of certain types of leukocytes.
What are four types of antigens?
There are three main types of professional antigen-presenting cells:
- Dendritic cells
- Macrophages
- B-cells
These APCs are very efficient at phagocytosis, which allows them to present exogenous as well as internal antigens. More importantly for their function in stimulating naive T cells, they possess co-stimulatory molecules: cell-surface molecules that deliver essential signals to T cells, allowing the T cells to become activated and mature into fully functional forms.
Dendritic cells, and to a lesser extent macrophages, have the broadest range of antigen presentation and are probably the most important APC. Activated DCs are especially potent TH cell activators because they constitutively express co-stimulatory molecules such as B7. B cells, which express antibody, can very efficiently present the antigen to which their antibody is directed, but are inefficient APC for most other antigens. As well, there are specialized cells in particular organs (e.g. microglia in the brain, Kupffer cells in the liver) derived from macrophages that are also effective APCs.
Why is it adaptive for memory cells to remain in the immune system after an invasion by pathogens?
Memory cells provide faster and stronger immune response upon re-exposure to the same pathogen, aiding in quicker elimination of the threat. This mechanism improves overall immune system efficiency and provides long-term protection against recurrent infections.
Cellular components of bacteria that make it a powerful pathogen?
Bacteria have various cellular components that contribute to their pathogenicity, including surface structures like capsules, fimbriae, and flagella for adherence and invasion, as well as toxins that can damage host cells. Additionally, bacterial cell walls can protect against host defenses and aid in colonization of tissues. Some bacteria also possess specific virulence factors, such as secretion systems or biofilm production capabilities, that enhance their ability to cause disease.
How is the Hiv pathogen transmitted?
HIV can be transmitted through unprotected sexual contact, sharing needles or syringes contaminated with infected blood, from mother to child during pregnancy, childbirth, or breastfeeding, and through blood transfusions or organ transplants from infected donors.
What ways in which non pathogenic organisms benefit man?
Non-pathogenic organisms benefit humans by helping with digestion, producing essential nutrients like vitamin K, and supporting the immune system by competing with harmful pathogens for resources. Additionally, non-pathogenic organisms play important roles in soil health, recycling nutrients, and biodegradation of waste materials.
Phagocytes are a type of white blood cell that are made up of various components including a cell membrane, cytoplasm, and a nucleus. They also contain specialized structures like lysosomes that help them to engulf and digest foreign particles or pathogens in the body.
Are all microorganisms pathogenic?
No, not all microorganisms are pathogenic. Many microorganisms are harmless or even beneficial to humans and the environment. Pathogenic microorganisms are the minority, causing diseases under certain conditions.
Blood borne pathogens are disease-causing organisms carried in human blood?
Blood borne pathogens are those which can be transmitted when blood infected with them is transver from one person to other like AIDS virus is blood borne and also other example is H. infuenzae which cause influneza and many more others
What the name of the pathogen in trichinosis?
Trichomoniasis is caused by a protozoa named trichomonas vaginalis.
What percetage of bleach to water ratio will decontaminate a bloodborne pathogen?
The CDC recommends using a 1:10 dilution of bleach to water to effectively decontaminate bloodborne pathogens. This means mixing 1 part bleach with 9 parts water. Always follow the manufacturer's instructions for proper dilution and contact time for disinfection.
Pathogenic bacteria compose approximately 70 percent of all bacteria on earth?
Pathogenic bacteria make up only a small fraction of the overall bacterial population on Earth. Most bacteria are either harmless or beneficial to humans and the environment. Pathogenic bacteria are responsible for causing various types of infections in humans and animals.
The average output of urine for a normal healthy adult is?
The average output of urine for a normal healthy adult is about 800-2,000 milliliters per day, with a normal range of 0.5-2.0 liters. This can vary depending on factors such as fluid intake, diet, and overall health.
Basophils are the rarest type of leukocyte, making up less than 1% of the total white blood cells in circulation. They play a role in allergic reactions and the inflammatory response by releasing histamine and other chemicals.
What are the effects of having Acquired Immune Deficiency Syndrome?
Your immune system is shut down (pretty much)' and your body is unable to find fight diseases effectively. You get sick with the snap of a finger. It's exceedingly easier to die from otherwise fairly harmless viruses and other ailments.
The process of coating bacteria with serum protein attachment of phagocytes is called?
in some instances, adherence occurs easily, and the microorganism is readily phagocytized. Microorganisms can be more readily phagocytized if they are first coated with certain serum proteins that promote attachment of the microorganisms to the phagocyte. this process is called opsonization.
What usually accounts for the smallest percentage of leukocytes in a blood sample?
basophils. see page 645 in anatomy & physiology 8th
an opsonized bacteria is a foreign pathogen in the human body in which a floating antigen is attached to the epitope (protein on the bacteria) so that a phagocyte can easily recognize the bacteria and engulf and destroy it.
What is the function of the monocytes?
Monocytes are a type of white blood cells that play a crucial role in the immune system. They engulf and digest pathogens, dead cells, and debris through a process called phagocytosis. Monocytes also help regulate inflammation and can differentiate into macrophages or dendritic cells to further assist in immune responses.
