SwipeExam Get the app

Mechanics of inspiration

  • ATI TEAS
  • Science: Human Anatomy and Physiology
  • Multiple choice
  • Difficulty 3 of 5

Question

A student models a normal inhalation. Which combination of changes would draw air into the lungs?

  1. Diaphragm contracts; chest cavity expands; alveolar pressure falls.✓ Correct

    These changes create a pressure difference that draws air inward.

  2. Diaphragm relaxes; chest cavity shrinks; alveolar pressure rises.✗ Incorrect

    This describes the mechanical pattern of expiration.

  3. Diaphragm contracts; chest cavity shrinks; alveolar pressure rises.✗ Incorrect

    During inspiration, contraction enlarges the chest cavity and lowers alveolar pressure.

  4. Diaphragm relaxes; chest cavity expands; alveolar pressure rises.✗ Incorrect

    Normal inspiration involves contraction and a fall in alveolar pressure.

Answer

A. Diaphragm contracts; chest cavity expands; alveolar pressure falls.

Rationale

Inspiration requires muscular work. As the diaphragm contracts, the chest cavity enlarges and pressure inside the alveoli falls, allowing air to enter.

RememberInspiration expands the chest and lowers alveolar pressure.

Sources

  • Mechanics of Ventilation SEER Training Modules, National Cancer Institute · License: US government work (public domain) · Retrieved · Inspiration; Expiration

Last verified: 2 independent automated checks Question teas-shap-00031, version 1

Checks are automated. No licensed clinician has reviewed this question. Check the sources and your program’s materials.

Report an error in this question. For education only; not medical advice. See all sources and licenses.

More ATI TEAS sample questions