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________ Ensheaths umbilical cord
Mucous Membranes
The moist tissue linings of various body cavities, including the mouth, nose, throat, and reproductive tract, that protect against infection.
Mechanical Barriers
Physical or structural methods used to prevent or control the entry or exit of harmful substances or organisms in a particular area.
Skin
The body's largest organ, serving as a protective barrier between the inside of the body and the external environment.
Immunoglobulin
Proteins in the blood plasma, also known as antibodies, which are crucial for the immune system's response against pathogens.
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