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Pulmonary gas exchange

  • ATI TEAS
  • Science: Human Anatomy and Physiology
  • Select all that apply
  • Difficulty 3 of 5

Question

Which statements correctly describe gas movement at the lungs and body tissues? Select all that apply.

  1. At the lungs, oxygen enters the blood from inhaled air.✓ Correct

    Oxygen diffuses from alveolar air into pulmonary blood.

  2. At the lungs, carbon dioxide enters alveoli from blood.✓ Correct

    Carbon dioxide moves into the air spaces and can then be exhaled.

  3. At body tissues, oxygen moves from blood toward cells.✓ Correct

    Systemic exchange delivers oxygen from capillaries to nearby tissues.

  4. At body tissues, carbon dioxide moves from blood into cells.✗ Incorrect

    Carbon dioxide instead travels from tissue cells into systemic blood.

  5. At the lungs, oxygen moves from blood into alveolar air.✗ Incorrect

    The usual direction of oxygen diffusion in the lungs is into the blood.

Answer

A. At the lungs, oxygen enters the blood from inhaled air. · B. At the lungs, carbon dioxide enters alveoli from blood. · C. At body tissues, oxygen moves from blood toward cells.

Rationale

The lungs load blood with oxygen while transferring carbon dioxide to the air spaces. In systemic tissues, oxygen leaves the blood and carbon dioxide enters it.

RememberOxygen enters blood at the lungs and leaves it at body tissues.

Sources

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