5 Lung Tissues In Human and Its Functions

By | April 25, 2020
Lung Tissue

Lung Tissues In Human and Its Functions – A tissue is a set of cells that have the same shape and function. The tissues in the lungs are epithelium tissue, which is the tissue lining the surface of the organ. The lungs need to be protected because it is one important organ. The lungs are part of the human excretory system and the respiratory system in humans.

The Lung Tissue and its functions

The tissues that make up the lungs are layers squamous epithelium, simple squamous tissue, epithelium tissue, connective tissue, and muscle tissue.

  1. The tissue that lines the lungs is a tissue layers squamous epithelium. The tissue layers squamous epithelium is a flat, multi-layered epithelial cell. This tissue forms the pleura.
  2. Other tissues in the lungs are simple squamous epithelium tissue, which is a layer of flattened epithelium. This tissue is found in the lung alveoli.
  3. There are three tissues in the bronchus. The first a cilia epithelium tissue is found in the deepest layer of the bronchi. This tissue produces a lot of mucus that serves to capture dust and microorganisms that enter when breathing air. Dust and microorganisms will be excreted by cough.
  4. While the second is a ring of cartilage in the form of a letter C. Cartilage including connective tissue. The back of the ring of cartilage is not connected and attached to the esophagus. Its function is to keep the trachea open.
  5. The last is a smooth muscle that includes muscle tissue. Smooth muscles allow the lungs to work under our consciousness.


Alveolus is an anatomical structure that has a hollow shape. It is present in the lung parenchyma, which is the end of the respiratory tract, where both sides are the place of air exchange with the blood. Alveolus is an anatomy only owned by mammals. In the vertebrates the gas Exchange system has a different structure. The alveolar membrane is the surface where gas exchanges occur. The rich blood carbon dioxide is pumped from all over the body into the alveolar blood vessel, where, through diffusion, it releases carbon dioxide and absorbs oxygen. 

The lung tissues that serves as a place of oxygen and carbon dioxide exchange are alveoli.

The lungs accommodate the air that is sucked by humans. In the lungs, there are millions of small whip called Alveolus. Alveolus serves as a place of carbon dioxide gas (CO2) and water vapor (H2O) from the circulatory system with oxygen (O2) derived from air that is inhaled into the lungs.

This alveolus has a round shape and is moist, to facilitate gas exchanges. The alveolar shape of the sag gives the lungs a large surface area.

On this alveoli, the outer surface is surrounded by blood vessels called capillary veins.

In Alveolus, oxygen (O ₂) switches to the capillary veins. This movement occurs diffused, i.e. Passive displacement that follows the difference in concentration, from high oxygen concentrations in the lungs to blood with low oxygen concentrations.

This oxygen is tied to the blood by hemoglobin, which is a red pigment substance found in erythrocytes (red blood cells).

In the opposite process, carbon dioxide (CO ₂) moves towards alveoli from the capillary veins. As with oxygen exchanges, carbon dioxide exchanges are also in diffusion.

Blood in these lung capillary vessels is blood that is flowing in small blood circulation, which pumps dirty blood (rich carbon dioxide and less oxygen) from the heart, toward the lungs where gas exchange converts this blood into the clean blood (rich in oxygen and less carbon dioxide).

The net blood of this diffusion exchange result is then brought back to the heart to circulate throughout the body in large blood circulation.

Read also: Water in lungs: The causes, symptoms, How to prevent and Treat it

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