antigens
Prions are the proteins which invades organisms.. they are usually proteinaceous material devoid of nucleic acid but yet capable of producing diseases in humans and other animals..examples are scrapie, kuru, etc..
A virus is a non-living pathogen that invades body cells to replicate and cause infection.
Foreign materials can enter the body through various means, including inhalation (breathing in particles), ingestion (eating or drinking contaminated substances), injection (such as through wounds or medical procedures), and absorption through the skin or mucus membranes. Once inside, these materials can cause harm and trigger immune responses.
A pathogen is an organism or substance that invades the body and causes damage to cells or tissues, leading to illness or infection. Examples of pathogens include bacteria, viruses, fungi, and parasites.
The lymphatic system uses lymph nodes to filter and remove foreign material, such as pathogens, dead cells, and toxins from the body. Lymph nodes act as checkpoints where immune cells can detect and respond to harmful substances present in the lymph fluid.
Antigenan·ti·gen/ˈantijən/Noun:A toxin or other foreign substance that induces an immune response in the body, esp. the production of antibodies.
A foreign occupation is when Another Country invades and takes over another county.
Prions are the proteins which invades organisms.. they are usually proteinaceous material devoid of nucleic acid but yet capable of producing diseases in humans and other animals..examples are scrapie, kuru, etc..
antigens
parasits
A virus is a non-living pathogen that invades body cells to replicate and cause infection.
Virus
Protists
Antigens are foreign proteins that your immune system can recognize as being harmful to your body, so it produces antibodies that memorize the antigen protein so it can launch an immune response if it ever again invades your body.
Foreign materials can enter the body through various means, including inhalation (breathing in particles), ingestion (eating or drinking contaminated substances), injection (such as through wounds or medical procedures), and absorption through the skin or mucus membranes. Once inside, these materials can cause harm and trigger immune responses.
Proteins play a major part in protecting our cells and our body.
A foreign substance is any material that is not naturally present in a certain environment or body. It can come from outside sources and may cause harm, contamination, or interference with normal processes.