Mucus

Mucus is a slippery fluid that our bodies make to keep us safe. It is found in places like our noses, throats, stomachs, eyes, and ears. This special fluid helps catch and push away tiny germs, such as bacteria and viruses, that could make us sick.

Our bodies make mucus in special cells called mucous glands. It contains important substances that help fight off infections and protect our cells. Most of the mucus in our bodies is made in our digestive system.

Even animals like fish, snails, and slugs make mucus. For them, it helps protect against germs, aid in movement, and line the gills of fish. Plants also make something similar called mucilage, which is used by some tiny living things too.

In your body, the respiratory system makes mucus to keep your lungs safe. Mucus is a special liquid that lines your airways. It catches tiny particles like dust and germs before they can get into your lungs. The mucus helps move these particles out of your body when you cough or swallow.

Mucus is made mostly of water and special proteins. It is made by cells in your airways and helps keep the air moist. When you have a cold or allergies, you might make more mucus. This can make your nose runny or feel stuffy. Your body also makes extra mucus when the air is dry. This helps keep your nose and airways from drying out.

In the human digestive system, mucus helps food move smoothly down the esophagus. It is very important in the gastrointestinal tract, where it forms a protective layer in the colon and small intestine. This layer helps keep the gut calm by keeping bacteria away from the cells that line the intestines.

The gastric glands in the gastric mucosa make gastric juice that contains enzymes and gastric acid, which can hurt the stomach. To protect the stomach wall, some glands make a thick layer of mucus. This mucus lines the stomach and creates a barrier that keeps the stomach safe.

Nasal mucus is usually clear and thin, helping to clean the air we breathe. When we get sick, like with a cold or flu, the mucus can change to yellow or green. This happens because of germs or the body’s way of fighting them off.