Answer :
Surface membrane barriers are the first line of defense against potential pathogens. They form a physical barrier to prevent the entry of harmful microorganisms, such as bacteria and viruses.
The skin is the most important surface membrane barrier. It serves as a waterproof layer that prevents bacteria and other microorganisms from entering the body. The mucous membranes of the respiratory, digestive, and urinary tracts also serve as a barrier, trapping and destroying pathogens before they can enter the body.
The body's non specific internal defenses include the immune system and physical barriers such as the stomach acid. The immune system is composed of white blood cells that protect the body from foreign invaders. Natural killer cells are a type of white blood cell that can quickly recognize and destroy foreign invaders. Phagocytosis is another nonspecific defense. This is the process in which white blood cells engulf and destroy pathogens.
The body can also increase its defenses by producing a fever. A fever increases the body temperature, making it harder for pathogens to thrive. Finally, inflammation is the body's response to an infection. The body releases chemicals, such as histamine, to trigger inflammation and attract more white blood cells to the area of infection.
Learn more about Natural killer cells at :https://brainly.com/question/16240473
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