Gas+Exchange+in+the+Alveoli

=Unit 1 Cells and Systems=

Chapter 2 Human body systems work independently and together.

 * 2.3 Gas Exchange in the Alveoli** page 91

As you may know, the alveolus is surrounded by capillaries which looks like a bunch of grapes on a stem. This is where the respiratory structures and the circulatory structures interact. The process that occurs here is called gas exchange. Gas exchange is when the oxygen from the alveolus diffuse into the capillaries and in return, carbon dioxide diffuses into the alveolus. If you look at Figure 2.33 on page 91, you'll notice that the capillaries are binded with red blood cells. In the end, the oxygenated blood returns to the heart to be pumped to the rest of the body.


 * **Questions** || **Answers** ||
 * **1.** What is surrounded by capillaries? || Alveolus is surrounded by capillaries. ||
 * **2.** This is where the respiratory structures interact with what other structure? || The respiratory structures interact with the circulatory structures. ||
 * **3.** The carbon dioxide diffuses into the alveolus, true or false? || This statement is true. ||
 * **4.** What is the gas exchange? Describe. || Gas exchange occurs by diffusion of oxygen and carbon dioxide between the aveoli and capillaries. The oxygen travels from the aveoli to the capillaries and the carbon dioxide travels from the capillaries to the aveoli. ||
 * **3.** The carbon dioxide diffuses into the alveolus, true or false? || This statement is true. ||
 * **4.** What is the gas exchange? Describe. || Gas exchange occurs by diffusion of oxygen and carbon dioxide between the aveoli and capillaries. The oxygen travels from the aveoli to the capillaries and the carbon dioxide travels from the capillaries to the aveoli. ||
 * **4.** What is the gas exchange? Describe. || Gas exchange occurs by diffusion of oxygen and carbon dioxide between the aveoli and capillaries. The oxygen travels from the aveoli to the capillaries and the carbon dioxide travels from the capillaries to the aveoli. ||