Your heart sends deoxygenated blood to the lungs. Oxygen and carbon dioxide exchange happens here. into the lungs through the right and left main bronchiĮach alveolus is covered by a net of tiny blood vessels called capillaries.When you breathe, air enters through your mouth and nose and travels: You exhale (breathe out) carbon dioxide during expiration. What is respiration? Respiration is made up of two phases called inspiration and expiration: You inhale (breathe in) oxygen during inspiration. ![]() The bronchial tree running through your lungs is made up of the windpipe, bronchi, bronchioles, and alveoli. This means there’s plenty of room for vital oxygen to pass into your body. The small bubble shapes of the alveoli give your lungs a surprising amount of surface area - equivalent to the size of a tennis court. There are about 600 million alveoli in your lungs. They look like tiny grape bunches or very tiny balloons. You have almost 30,000 bronchioles in each lung.Įach bronchiole tube ends with a cluster of small air sacs called alveoli (individually referred to as alveolus). Some of them are so tiny that they have the thickness of a hair. Like the branches of a tree, these tiny tubes stretch out into every part of your lungs. The bronchi branch off into smaller bronchi and even smaller tubes called bronchioles. This “Y” is often called the bronchial tree. The trachea and bronchi airways form an upside-down “Y” in your chest. Each lung has a tube called a bronchus that connects to the trachea. The trachea is a tube that carries the air in and out of your lungs. The lungs begin at the bottom of your trachea (windpipe). The left lung has only two lobes to make room for your heart. ![]() The right lung is made up of three lobes. This spongy, pinkish organ looks like two upside-down cones in your chest.
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