Answer:
includes skin, tears, saliva, mucous membranes, and the digestive system
Explanation:
Most provoke rejection and are subject to taboos, but without them our body would hardly survive. We refer to humors, an unusual group of secretions, fluids, liquids and mucus.
Our body is literally riddled with openings that allow us to breathe, listen, see, refrigerate, ingest nutrients, expel, waste, reproduce and breastfeed the offspring.
Each of these openings offers microbes the possibility of sneaking into the body and causes a mess that can be lethal. That is why there is not a single body entrance, from the mouth to a pore in the skin, that is not properly protected by some defense mechanism.
A large part of the moods of our body participate in this task. The constant washing of the eyes by the drops of tears, loaded with antibodies and lubricating products, cleans germs and particles the delicate ocular surface. The saliva that continually bathes the mouth kills some microbes, such as the bacteria that form the bacterial plaque and tartar, and leads to the stomach other undesirable ones, which are blackened by stomach acids. And some glands located inside the ears secrete earwax, an oily substance with bactericidal action.
All respiratory ducts are covered with mucous membranes that moisten, lubricate and prevent the attack of infectious agents. Through a series of microscopic hairs called cilia, which constantly perform a sweeping mill, these mucus are constantly renewed in order to keep their effectiveness alive.
Occasionally, the mucous glands work on the piece if it threatens any danger. For example, irritation of the nose or bronchial tubes by a virus causes a copious discharge of mucus that frequently clogs the airways. Mucus is also violently expelled through sneezing. Although this is a double-edged sword: there are scientists who argue that some of them constitute a scheme designed by virile agents to disperse.
Cough, which operates under strict control of the brain, is also an efficient mechanism to expel undesirable microorganisms and particles from the body.
The digestive system has its special defenses. Although we may not be aware, the person in charge of digestion closely monitors everything we put in our mouths. If a food contaminated by a microbe or a toxin manages to overcome the barriers of saliva and mucous membranes of the first section of the digestive tract, receptors in the stomach can give the warning voice. If this occurs, the brain activates the mechanisms of nausea and vomiting. The latter expels the toxin before it continues to be absorbed.
