The American Black Bear obtains air the same way all mammals do, with the exchange of two gases: oxygen and carbon dioxide. We need oxygen for cellular respiration to give us needed energy for everyday life. Cellular respiration combines H20, glucose, ATP, CO2, and 02. ATP is a triphosphate. When the third bond breaks to give us energy it becomes ADP but when we intake glucose it builds back into ATP.
When the American Black Bear is obtaining O2 it goes through the nasal cavity, larynx. trachea, bronchi, bronchioles, and finally to the alveoli. When all oxygen is used up in the American Black Bear's bloodstream C02 is produced. When the American Black Bear is breathing out CO2 it goes through the alveoli, bronchioles, bronchi, trachea, larynx, and finally to the nasal cavity. The American Black Bear obtains oxygen in the air. The American Black bear does not have to move through the air to recieve oxygen.
The nasal cavity cleans the bacteria in the air. The larynx is closed during breathing. The trachea allows gases to go in and out of the American Black Bear. The bronchi are the tubes leading into the lungs. The bronchioles are located in the American Black Bear's lungs, where the gas exchange happens. Finally, there is the alveoli which is where oxygen diffuses into the blood.
The American Black Bear's lungs are very large. During hibernation the bear only takes in half as much oxygen as it would on a normal day. (1)
(1) http://www.bear.org/website/bear-pages/black-bear/hibernation.html
When the American Black Bear is obtaining O2 it goes through the nasal cavity, larynx. trachea, bronchi, bronchioles, and finally to the alveoli. When all oxygen is used up in the American Black Bear's bloodstream C02 is produced. When the American Black Bear is breathing out CO2 it goes through the alveoli, bronchioles, bronchi, trachea, larynx, and finally to the nasal cavity. The American Black Bear obtains oxygen in the air. The American Black bear does not have to move through the air to recieve oxygen.
The nasal cavity cleans the bacteria in the air. The larynx is closed during breathing. The trachea allows gases to go in and out of the American Black Bear. The bronchi are the tubes leading into the lungs. The bronchioles are located in the American Black Bear's lungs, where the gas exchange happens. Finally, there is the alveoli which is where oxygen diffuses into the blood.
The American Black Bear's lungs are very large. During hibernation the bear only takes in half as much oxygen as it would on a normal day. (1)
(1) http://www.bear.org/website/bear-pages/black-bear/hibernation.html