Ventilation in birds is accomplished by expansion and contraction of the ( ).
A: air sacs
B: trachea
C: lungs
D: diaphragm
E: air capillaries
A: air sacs
B: trachea
C: lungs
D: diaphragm
E: air capillaries
举一反三
- ____ serve(s) as a food and air passageway. A: Pharynx B: Larynx C: Trachea D: Lungs
- The small air sacs in the lungs through which gases are exchanged between the atmosphere and the blood are the __.
- which type of epithelium is thin and leaky and lines blood vessels and the air sacs of the lungs A: Stratified squamous epithelium B: Cuboidal epithelium C: Simple squamous epithelium D: Simple columnar epithelium
- The disadvantage of district ventilation is that there are many return air shafts and ventilation equipment.
- The direct motivation for lung ventilation comes from A: lung contraction B: elastic retraction of the lungs C: relief and contraction of respiratory muscles D: intrapulmonary pressure and atmosphere pressure difference