Anatomy & Physiology Respiratory #9

Question

Which is the correct order in which oxygen passes through the respiratory system?

Answers

  1. Nasal cavities, larynx, pharynx, trachea, lungs.
    • Rationale:

      This is not the correct order in which oxygen passes through the respiratory system. Once inhalation begins, oxygen from the air enters the nasal cavities and then passes through the pharynx, not the larynx.

  2. Nasal cavities, trachea, larynx, pharynx, lungs.
    • Rationale:

      This is not the correct order in which oxygen passes through the respiratory system. Once inhalation begins, oxygen from the air enters the nasal cavities and then passes through the pharynx, not the trachea.

  3. Nasal cavities, pharynx, larynx, trachea, lungs.
    • Rationale:

      This is the correct sequence in which oxygen passes through the respiratory system in order for gas exchange to occur.

  4. Nasal cavities, pharynx, trachea, lungs, larynx.
    • Rationale:

      This is not the correct order in which oxygen passes through the respiratory system. Once inhalation begins, oxygen from the air enters the nasal cavities and continues on its path through the pharynx to the larynx, not the trachea.

Overview

The flow of air from outside of the body to the lungs follows a specific sequence through the structures of the respiratory system.

Explanation

Learning Outcomes

Respiration is a sequence of events that results in the gas exchange between the atmosphere and the cells of the body. Nerve impulses stimulate the breathing process, or ventilation every 3 to 5 seconds. This impulse causes inhalation of air through the nasal cavity where it proceeds through the pharynx, larynx, and the trachea before it reaches the lungs.

Test Taking Tip

Think about the structures of the respiratory system and the process of breathing when determining the correct answer choice for this question.

Video Rationale