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A vaccines helps because they put some of the disease in your body then your body can get use to it so if you get that disease your body can easily fight it out of you!
The hydrochloric acid in the stomach helps protect against disease because it kills many microorganisms and toxins in food.
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The fluid that carries different substances and cells that help regulate body functions and protect the body against disease and infections is called blood.
Antigens do not protect the body from disease. Antibodies protect the body from many diseases.
The skin, hair, and nails provide a protective layer for the body. The skin acts as a barrier against harmful substances, prevents dehydration, and helps regulate body temperature. Hair helps to protect the scalp from UV radiation and provides insulation. Nails protect the fingertips and enhance tactile sensations.
The fat layer under the skin is also known as the subcutaneous layer and is the deepest layer of skin under the epidermis and the dermis. The fat layer helps to insulate the body from both heat and cold and it provides a storage area for energy as well as providing a protective layer of padding to help protect internal structures of the body.
Vaginal Secretions techniquely do not protect the body from disease. For example, STD, women still get them. However it does protect the body from infections. The secretion is very acidic and kills most infections.
Immunity
The purpose of the fatty layer is to insulate and protect your body.
Antibodies
If you knew what a disease was, you'd know that they are things that harm or kill people. Then you'd know why the body needs to protect against them.