Pulmonary alveolus
Pulmonary Alveolus
The Pulmonary Alveolus (pronounced: puhl-MON-uh-ree al-VEE-uh-luhs) is a crucial component of the respiratory system in mammals. The term originates from the Latin word 'alveolus' meaning 'small cavity'.
Definition
A Pulmonary Alveolus is a tiny, sac-like structure present in the lungs where the exchange of oxygen and carbon dioxide takes place.
Function
The primary function of the Pulmonary Alveolus is to allow the rapid exchange of oxygen and carbon dioxide during respiration. This process is facilitated by the thin walls of the alveoli and the extensive network of capillaries that surround them.
Structure
Each Pulmonary Alveolus is a hollow cavity surrounded by a network of capillaries. These capillaries are so close to the alveolus that oxygen and carbon dioxide can pass through them by diffusion.
Related Terms
- Respiratory System: The group of tissues and organs in your body that enable you to breathe.
- Lung: The pair of respiratory organs located in the thorax which remove carbon dioxide from and bring oxygen to the blood.
- Oxygen: A chemical element of atomic number 8 and symbol O. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent.
- Carbon Dioxide: A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and is absorbed by plants in photosynthesis.
- Capillaries: The smallest of the body's blood vessels. They are only one cell thick, and they are the sites of the transfer of oxygen and other nutrients from the bloodstream to other tissues in the body.
- Diffusion: The process by which molecules intermingle as a result of their kinetic energy of random motion.
External links
- Medical encyclopedia article on Pulmonary alveolus
- Wikipedia's article - Pulmonary alveolus
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