The notch or depression where the bronchus, the blood vessels and the nerves enter the lung is the:
Hilum
Epiglottis
Nares
Conchae
The Correct Answer is A
A. The hilum is the region on the medial side of the lung where the bronchus, blood vessels, and nerves enter and exit the lung.
B. The epiglottis is a flap of tissue that covers the trachea during swallowing to prevent food from entering the airways, but it is not related to the entry of structures into the lung.
C. The nares are the nostrils through which air enters the respiratory system, not the area where the bronchus and vessels enter the lung.
D. The conchae (also known as turbinates) are structures inside the nasal cavity that help warm and humidify air, not related to the lung’s entry point.
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Related Questions
Correct Answer is C
Explanation
A. The internal exchange of gases occurs at the tissue level, where oxygen is delivered to cells and carbon dioxide is removed. The diaphragm is not involved in this process.
B. Exhalation involves the relaxation of the diaphragm, which causes the lungs to compress and air to be expelled from the lungs.
C. During inhalation, the diaphragm contracts and moves downward, creating more space in the chest cavity, which allows the lungs to expand and air to flow in.
D. The external exchange of gases occurs in the lungs, where oxygen is transferred into the blood and carbon dioxide is removed, but it is not directly linked to diaphragm contraction.
Correct Answer is B
Explanation
A. Carbon dioxide does diffuse into the blood from the alveoli, but oxygen diffuses into the blood from the alveoli, not into the alveoli.
B. Oxygen diffuses from the alveoli into the blood where it binds to hemoglobin in red blood cells, while carbon dioxide diffuses from the blood into the alveoli to be exhaled.
C. Both oxygen and carbon dioxide do not diffuse from the alveoli into the blood at the same time. Only oxygen moves into the blood, and carbon dioxide moves in the opposite direction, from the blood to the alveoli.
D. While carbon dioxide moves from the blood into the alveoli, oxygen moves in the opposite direction, from the alveoli into the blood, so this answer is incorrect.
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