Without mucus your stomach would eat it self. The acids help break food down.
Sebum, a natural oily substance produced by the sebaceous glands in the skin, contains pathogen-inhibiting agents such as fatty acids and other chemicals that help protect the skin from harmful microorganisms.
Skin, mucus, hair, etc.
Four barriers that protect humans from pathogens include the mucus of the upper respiratory system, the acid mantle of the skin, the stomach acid in the digestive system, and the cervical mucus of the female reproductive system. There are also celular barriers via the immune system that prevent infection.
The first line of immune defense is the skin and mucus membranes. Skin acts as a physical barrior, blocking pathogens from entering. Mucus wihin the nasal cavity blocks some of the pathogens from entering the body. Cilia also aid in protectiong by acting as a barrior as well. There is also mucus lining the bronchial tubes, which like other mucus, blocks pathogens.
mucus in your nostrils, your skin, hair in your nose
No, nipples are not considered mucous membranes. Mucous membranes line various body cavities and organs that are exposed to the external environment, such as the mouth, nose, and digestive tract, and secrete mucus to protect against infection. Nipples are composed of skin, glandular tissue, muscle, and connective tissue, but do not secrete mucus.
The body has a number of natural barriers, your skin, your eyelashes, mucus and even tears are all natural barriers to name but a few.
Yes, acids will burn skin.
Mucus
Mucus serves as a nonspecific defense to pathogens by trapping them as they try to enter the body through the respiratory or digestive system. The mucus contains enzymes and antibodies that help neutralize and eliminate pathogens, preventing them from causing infections. Additionally, the cilia in the respiratory tract help move the mucus and trapped pathogens out of the body.
sinse they live in the digestive tract there skin is resistant to acids. sort of like getting A tan so you don't burn
Frog's produce a slimy substance called mucus, the mucus comes from glands in the frogs skin. The glands and mucus is extremely important to the survival of the frogs due to the respiration and hydration. Not all frogs are slimy though, some frogs have rough dry skin.