Immune System

Gas exchange in the respiratory system occurs in the alveoli of the lungs and in the capillaries that surround them. Oxygen from the air diffuses into the bloodstream through the alveoli, while carbon dioxide diffuses out of the bloodstream into the alveoli to be exhaled.

An organism such as an insect that transmits pathogens is referred to as a vector. Vectors can transmit diseases such as malaria, Zika virus, and Lyme disease by carrying pathogens from one host to another. Controlling vector populations is crucial in preventing the spread of these diseases.

Yes, leukocytes, also known as white blood cells, are nucleated which means they contain a nucleus. This nucleus contains genetic material and plays a role in various cellular functions such as cell division and gene expression.

The type of agranular leukocyte with a kidney-shaped nucleus is a monocyte. Monocytes are a type of white blood cell that plays a role in the immune response by engulfing pathogens and debris. They can differentiate into macrophages or dendritic cells when they migrate to tissues.

the immune system is able to recognize and respond to specific pathogens or antigens, allowing it to target and eliminate specific threats while leaving the rest of the body's cells unharmed. This specificity is achieved through the recognition of unique markers on antigens by immune cells such as T and B lymphocytes.

Your lymphatic system send tissue fluid to you skin cells. then it "cleans and destroys all pathogens invading it. Then the tissue fluid turns into lymph and goes to do whatever it needs to do in your body.

Antibodies are bound to the surface of a B cell. These antibodies serve as receptors that allow the B cell to recognize and bind to specific antigens. This binding process helps initiate the immune response by activating the B cell to differentiate into plasma cells that secrete antibodies.

Prions are infectious agents that can cause diseases in animals by forming misfolded proteins that lead to the accumulation of protein clumps in the brain. These protein clumps disrupt normal cellular function, eventually leading to neurological symptoms and disease progression. Examples of prion diseases in animals include scrapie in sheep and bovine spongiform encephalopathy (BSE) in cattle.

Yes, Herceptin is a drug used in certain form of breast cancer which overexpresses the HER-2 protein, enabling angiogenesis and rapid tumour growth. Herceptin is the trade name for monoclonal antibodies against the HER-2 receptor which block these, limiting their function and improving patient prognosis.

There are other examples to, monoclonal antibodies against IgE antibody to prevent type 1 hypersentivity e.g. peanut allergy.

yes, tears prevent pathogens from entering the eye. when an irritation occurs the eye produces a salty liquid (tears) to clean the eye from any dust or pathogens.

eyelashes also prevent pathogens and dust from entering.

In terms of a chemical barrier, your tears contain the enzyme lysozyme which can disrupt the cell walls of gram-positive bacteria by digesting the peptidoglycan in them. This enzyme is also found in your saliva.

1. Disrupting the pathogen's cell membrane or wall using physical or chemical means.
2. Inhibiting the pathogen's metabolic processes or replication through heat, radiation, or disinfectants.
3. Blocking the pathogen's ability to infect host cells or evade the immune system through antibodies or antiviral drugs.

Emerging viruses

Schistosomiasis is a major parasitic disease (also known as Bilharzia and snail fever) infecting humans and domestic livestock, and caused by several species of flatworms in the genusSchistosoma. Snails serve as the intermediary agent between mammalian hosts. Individuals within developing countries who cannot afford proper sanitation facilities are often exposed to contaminated water containing the infected snails.

Yes you can be infected with a pathogen but not show any signs or symptoms but you can still pass it on it other people.

Antibodies are specialized proteins produced by the immune system that help recognize and neutralize harmful pathogens like bacteria and viruses. They bind to specific antigens on the surface of these microorganisms, marking them for destruction by other immune cells.

The medical term is "phagocyte." Phagocytes are a type of white blood cell that can engulf and destroy invading cells, pathogens, and other harmful substances in the body. They play a crucial role in the immune response to infections.

To identify the pathogen causing a specific disease, the steps typically involve collecting samples from the affected individual, isolating the pathogen in the laboratory, analyzing its characteristics through techniques like microscopy or genetic testing, and comparing the results to known pathogens in databases to make a definitive identification. Additional tests may also be performed to confirm the findings and determine the best course of treatment.

called chemotaxis. Chemicals released from damaged cells act as signals that guide leukocytes to the site of injury or infection, helping to initiate the inflammatory response and target the source of damage for immune defense and repair.

Pathogens can be spread in hospitals through healthcare workers who are not following proper hand hygiene protocols, contaminated medical equipment and surfaces, airborne transmission from coughing or sneezing, direct contact with infected patients, and through improperly sterilized instruments or devices.

White blood cells will increase in number when you are sick. There are several types and each will respond differently to the type of infection. Neutrophils are very active and are generally the first to attack bacteria at the site of an injury. While digesting pathogens, neutrophils release prostaglandins that affect local capillaries, and leukotrienes that attract other phagocytes. The breakdown of used neutrophils in an infected wound forms pus.The normal number of WBCs in the blood is 4,500-10,000 white blood cells per microliter (mcL).

Compromised immune systems are not able to effectively defend the body against infections and illnesses. This can lead to frequent and severe infections, increased susceptibility to diseases, and difficulties in recovering from illnesses. It is important for individuals with compromised immune systems to take extra precautions to stay healthy.

I had my gall bladder removed, and I have suffered a cold or flu every month without fail since! I used to get a cold yearly, if not less. Now I'm plagued by them constantly and the trigger was definitely my cholecystectomy