Multiple Choice
With one exception, the skull bones are joined by sutures. Which bone is the exception?
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1. Introduction to Anatomy & Physiology
Introduction to Directional Terms
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Contraction of the internal intercostals ______ the ribs.
A
rotates
B
extends
C
elevates
D
depresses
Verified step by step guidance1
Understand the role of the internal intercostal muscles: These muscles are located between the ribs and are involved in respiration, specifically during forced expiration.
Recall the mechanics of breathing: During forced expiration, the internal intercostals contract to pull the ribs downward, reducing the volume of the thoracic cavity and aiding in expelling air from the lungs.
Differentiate the actions of the internal intercostals from the external intercostals: While external intercostals elevate the ribs during inspiration, internal intercostals depress the ribs during forced expiration.
Match the action of the internal intercostals to the correct term: The term 'depresses' accurately describes the downward movement of the ribs caused by the contraction of the internal intercostals.
Conclude that the correct answer is 'depresses' based on the anatomical function of the internal intercostals during forced expiration.
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