Table of Contents
What is the exchange of gases between the alveolar air and the blood called?
Every 3 to 5 seconds, nerve impulses stimulate the breathing process, or ventilation, which moves air through a series of passages into and out of the lungs. After this, there is an exchange of gases between the lungs and the blood. This is called external respiration.
What causes diffusion between alveoli and the blood?
The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries. As a result, oxygen diffuses across the respiratory membrane from the alveoli into the blood. In contrast, the partial pressure of carbon dioxide is high in the pulmonary capillaries and low in the alveoli.
What is the exchange of gases between the alveolar air and the blood called quizlet?
External respiration refers to gas exchange between inhaled air and blood, whereas internal respiration refers to gas exchange between the blood and tissue fluids. How does external respiration differ from internal respiration? Oxygen moves from the lungs into the blood during internal respiration.
What is the exchange of gases across the respiratory membrane?
External respiration is the exchange of gases with the external environment, and occurs in the alveoli of the lungs. Internal respiration is the exchange of gases with the internal environment, and occurs in the tissues. The actual exchange of gases occurs due to simple diffusion.
Which disease is the alveoli ventilated but not perfused?
In pulmonary shunt, alveoli are perfused but not ventilated. Blood flowing past poorly ventilated alveoli doesn’t pick up additional oxygen. This poorly oxygenated blood returns to the heart and mixes with oxygenated blood coming from other areas of the lungs that are ventilated.
Where does gas exchange occur between the lungs and the blood quizlet?
gas exchange occurs between the air in the alveoli and the blood in the capillaries.
What tissue would allow for gas exchange between the blood and the air in the lungs quizlet?
Alveoli are the site of gas exchange in the lungs. Because rapid diffusion of gases is necessary between the capillaries and the alveoli, a very thin epithelial layer is needed. As a result, alveoli use simple squamous epithelium so that gases can easily diffuses to and from the bloodstream.