Gas exchange between the blood and air occurs in the:[Fill in the blank]

Question

BlackTom AI · Accepted Answer

The question asks where gas exchange between the blood and air occurs.
Option a: Conducting airways. While these structures (like the trachea and bronchial tree) transport air, they do not participate in gas exchange—no thin walls or capillary network for diffusion are present here, so this is not correct.
Option b: Bronchioles. Bronchioles are part of the conducting airway system; they conduct air to the alveolar regions but the walls are not optimized for gas exchange. Gas diffusion does not occur mainly across their walls, so this choice is inaccurate.
Option c: Aorta. The aorta is a major blood vessel that carries oxygenated blood away from the heart to the body. It is not involved in exchanging gases with air, so this option is clearly incorrect.
Option d: Alveoli. Alveoli are tiny air sacs with extremely thin epithelial walls and are surrounded by a dense capillary network. This structure provides the large surface area and very short diffusion distance required for efficient gas exchange of oxygen into blood and carbon dioxide out of blood. Hence, this is the correct site for gas exchange.
Overall, the incorrect options misidentify the function or location of gas transfer, while the alveoli uniquely satisfy the anatomical and physiological requirements for diffusion between air and blood.

Gas exchange between the blood and air occurs in the:[Fill in the blank]单项选择题

类似问题

Continuous bubbling in the water‑seal chamber of a chest drainage system indicates?

Contraction of the respiratory diaphragm and external intercostal muscles leads to a [ Select ] rise drop in alveolar pressure, which results in [ Select ] inhalation exhalation .

What are two effective breathing exercises for improving lung function?

Which respiratory structure serves as the main airway to the lungs?

Identify the correct sequence of the parts of the respiratory system through which air passes as it enters the body.

Mr. Stuckey has a history of COPD. He experienced an exacerbation of his condition and was taken to the emergency department for treatment. What does COPD stand for?

Warm-blooded animals consume much more oxygen per body mass than cold-blooded animals. Which of the features below helps them in reducing moisture loss through breathing a lot of air?

The area in the lungs where oxygen and carbon dioxide are exchanged is called the:

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单