Question

During respiration, exchange of gases occurs in:

• A. Alveoli
• B. Bronchi
• C. Larynx
• D. Trachea

Answer 1

The Correct Option is A

Respiratory System Overview:

Alveoli:
The lungs contain minute, sac-like alveoli where gas exchange (oxygen and carbon dioxide) takes place. Capillaries surround these alveoli. Their thin walls, along with those of the capillaries, facilitate gas diffusion. Oxygen from inhaled air enters the bloodstream, while carbon dioxide from the blood is expelled during exhalation. This process is vital for respiration and delivering oxygen to bodily tissues.

Bronchi:
These are the major airways that branch from the trachea into the lungs. The trachea splits into the left and right bronchi, which then subdivide into smaller bronchioles. Air travels through these passages to and from the alveoli for gas exchange. They are coated with mucus and cilia to capture dust and microbes, thus protecting the respiratory system.

Larynx:
Known as the voice box, the larynx is situated at the upper part of the trachea and is crucial for sound production. It houses the vocal cords, which vibrate as air passes through, enabling speech. The larynx also functions as an air conduit to the trachea and lungs.

Trachea:
The trachea, or windpipe, is a tube connecting the larynx to the bronchi. It serves as the primary airway for air entering the lungs. Cartilage rings reinforce the trachea to prevent collapse. Its inner lining of mucous membranes and cilia filters and traps airborne particles before they reach the lungs.

Summary:
Air moves through the bronchi and trachea, but it is within the alveoli that the critical exchange of gases with the blood occurs. Oxygen is transferred to the blood, and carbon dioxide is removed, supporting the body's respiratory functions.