Lungs
The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.
The bronchioles eventually end in clusters of microscopic air sacs called alveoli. In the alveoli, oxygen from the air is absorbed into the blood. Carbon dioxide, a waste product of metabolism, travels from the blood to the alveoli, where it can be exhaled. Between the alveoli is a thin layer of cells called the interstitium, which contains blood vessels and cells that help support the alveoli.
The lungs are covered by a thin tissue layer called the pleura. The same kind of thin tissue lines the inside of the chest cavity -- also called pleura. A thin layer of fluid acts as a lubricant allowing the lungs to slip smoothly as they expand and contract with each breath.
The tiny hairs that catch hairs and dirt inside your lungs are called cilia.
FACT: Did you know that trees breath in carbon dioxide and breath out oxygen? That's why if you're on a tube it's more stuffy than when you're on a walk in the woods.
Although it may not seem the right lung is bigger than the left in order to make room for the heart.The right lung consists of the upper lobe, middle lobe and lower lobe. The lower lobe, the largest of the three, is separated from the upper and middle lobes by a fissure. The upper lobe makes up approximately one-third of the right lung. The left lung has upper and lower lobes that are also separated by a fissure. The lobes of both lungs work to expel carbon dioxide from the body and ensure the organs receive an adequate supply of oxygen.