BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
LYMPH NODES
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Stomach Acid
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Mucous Membranes
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Cilia
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Skin
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Detailed explanation-1: -The epidermis functions as a physical barrier to the external environment and works to prevent loss of water from the skin.
Detailed explanation-2: -One of the body’s most important physical barriers is the skin barrier, which is composed of three layers of closely packed cells. The thin upper layer is called the epidermis. A second, thicker layer, called the dermis, contains hair follicles, sweat glands, nerves, and blood vessels.
Detailed explanation-3: -Protection offered by the skin and mucous membranes All outer and inner surfaces of the human body a key part of the innate immune system. The closed surface of the skin and of all mucous membranes already forms a physical barrier against germs, which protects them from entering.