Question

During respiration, exchange of gases occurs in:

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

Answer 1

The Correct Option is A

Explanation of the Respiratory System:

Alveoli:
The alveoli are tiny, balloon-like air sacs located in the lungs where the exchange of gases (oxygen and carbon dioxide) occurs. The alveoli are surrounded by capillaries, and the walls of the alveoli and capillaries are thin, allowing gases to diffuse across them. Oxygen from the air moves into the blood, while carbon dioxide from the blood moves into the air to be exhaled. This process is essential for respiration and for supplying oxygen to the body's tissues.

Bronchi:
The bronchi are the larger airways that lead from the trachea into the lungs. The trachea divides into the left and right bronchi, which then further divide into smaller bronchioles. These airways allow the passage of air to and from the alveoli, where the actual gas exchange occurs. They are lined with mucus and cilia to trap dust and microbes, helping to protect the respiratory system.

Larynx:
The larynx, also known as the voice box, is located at the top of the trachea and plays an essential role in producing sound. It contains the vocal cords, which vibrate when air passes through them, allowing speech and sound production. The larynx also serves as a passage for air moving into the trachea and lungs.

Trachea:
The trachea, commonly known as the windpipe, is a tube that connects the larynx to the bronchi. It serves as the main airway through which air travels to the lungs. The trachea is reinforced with cartilage to prevent it from collapsing and is lined with mucous membranes and cilia to filter and trap particles from the air before it enters the lungs.

Conclusion:
While air flows through the bronchi and trachea, it is in the alveoli where the crucial exchange of gases with the blood occurs. Oxygen is transferred into the blood, and carbon dioxide is removed, facilitating the body's respiratory processes.