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lining the nasal cavity traps dust and microbes, acting as a physical barrier to pathogens.
Answer and Explanation

The Correct Answer is {"dropdown-group-1":"D"}

A. Peritoneal membrane: The peritoneal membrane lines the abdominal cavity and covers abdominal organs, providing lubrication and support. It does not have a direct role in trapping dust or microbes in the respiratory tract, so it is not involved in serving as a barrier to pathogens in the nasal cavity.

B. Serous membrane: Serous membranes line body cavities that do not open to the exterior, such as the thoracic and abdominal cavities, and secrete serous fluid to reduce friction. They do not trap dust or microbes and are not part of the respiratory defense system.

C. Pleural membrane: The pleural membrane surrounds the lungs and lines the thoracic cavity, producing pleural fluid to facilitate lung movement. While essential for respiratory mechanics, it does not interact with inhaled particles or serve as a barrier in the nasal cavity.

D. Mucous membrane: The mucous membrane lines the nasal cavity and produces mucus that traps dust, microbes, and other foreign particles. Combined with ciliary movement, it acts as a physical and immunological barrier, preventing pathogens from entering the lower respiratory tract and contributing to the first line of defense in the innate immune system.


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Related Questions

Correct Answer is ["4700"]

Explanation

Calculation:

  • Recall the formula for Vital Capacity:

VC = IC + ERV

Identify the values:

Inspiratory Capacity (IC) = 3500 mL

Expiratory Reserve Volume (ERV) = 1200 mL

  • Calculate Vital Capacity:

VC = IC + ERV

VC = 3500 + 1200

= 4700 mL

Correct Answer is B

Explanation

Correct answer: False

Terminal bronchioles represent the smallest airways in the conducting zone of the respiratory system and do not directly open into alveoli. Instead, they transition into respiratory bronchioles, which are the initial structures of the respiratory zone capable of gas exchange. The respiratory bronchioles then branch into alveolar ducts, which terminate in clusters of alveoli where the majority of gas exchange occurs. This anatomical progression ensures that air is conducted efficiently through the bronchiolar tree while maintaining separation between the conducting and respiratory zones. Therefore, stating that terminal bronchioles directly enter the alveoli is inaccurate and does not reflect the true structural organization of the lungs.

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