CLINICAL MEDICINE

Detailed explanation-1: -Answer and Explanation: T-cells are also a type of white blood cell that are present inside the body. T-cells are not considered as a physical barrier as these types of cells are produced or originated from the bone marrow and in the thymus, these cells will mature.

Detailed explanation-2: -Your integumentary system is your body’s outer layer. It’s made up of your skin, nails, hair and the glands and nerves on your skin. Your integumentary system acts as a physical barrier-protecting your body from bacteria, infection, injury and sunlight.

Detailed explanation-3: -The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.

Detailed explanation-4: -Natural barriers include the skin, mucous membranes, tears, earwax, mucus, and stomach acid. Also, the normal flow of urine washes out microorganisms that enter the urinary tract. to identify and eliminate organisms that get through the body’s natural barriers. (See also Overview of Infectious Disease.