Innate immunity are square defenses that humans develop square

Innate immunity refers to the body's natural, non-specific defenses that humans are born with. These defenses are present from birth and provide immediate protection against a wide range of pathogens, such as bacteria, viruses, and other foreign substances.<br /><br />The innate immune system is composed of various physical and chemical barriers, as well as specialized cells and molecules that work together to prevent the entry and spread of harmful agents. Some of the key components of innate immunity include:<br /><br />1. Physical barriers: The skin and mucous membranes act as physical barriers, preventing the entry of pathogens into the body. The skin is covered with a protective layer of dead cells that provide a physical barrier, while the mucous membranes lining the respiratory, digestive, and other tracts produce mucus that traps and removes pathogens.<br /><br />2. Chemical barriers: The body produces various chemical substances, such as enzymes, acids, and antimicrobial peptides, that can destroy or inhibit the growth of pathogens. For example, the stomach produces hydrochloric acid, which can kill many types of bacteria and other microorganisms.<br /><br />3. Specialized cells: The innate immune system includes various types of specialized cells, such as macrophages, neutrophils, and natural killer (NK) cells, that can recognize and eliminate pathogens. These cells are able to identify and respond to a wide range of pathogens, including bacteria, viruses, and parasites.<br /><br />4. Inflammatory response: When the body is injured or infected, the innate immune system triggers an inflammatory response, which involves the release of various signaling molecules and the recruitment of immune cells to the affected area. This response helps to contain the infection and initiate the healing process.<br /><br />Overall, the innate immune system provides a rapid and non-specific defense against a wide range of pathogens, helping to protect the body from infection and disease.