Which of the following best describes movements of the throracic wall?

Question

BlackTom AI · Accepted Answer

The task asks us to determine which statement best describes movements of the thoracic wall. 
Option a: 'Sternocleidomastoid can cause elevation of the sternum.' This statement aligns with anatomical and physiological understanding of respiration. The sternocleidomastoid is an accessory muscle of inspiration; when it contracts, it helps elevate the sternum and the upper ribs, increasing the anteroposterior and lateral dimensions of the thoracic cage to facilitate deeper inhalation. This reflects a plausible movement explanation for the thoracic wall during forced inspiration. 
Because no other options are provided in the set, we cannot compare alternative descriptions of thoracic wall movements (such as pure diaphragmatic movement, bucket-handle or pump-h handle rib movements, or movements during expiration). As a result, we can only assess the correctness of this statement in isolation: it correctly describes a recognized mechanism by which the thoracic wall can move (via sternum elevation facilitated by accessory muscles). 
Potential misconceptions to watch for in related options might include confusing thoracic wall movement with purely diaphragmatic expansion (which is a primary, not exclusive, driver of inspiration), or asserting that only one muscle type causes thoracic wall movement (in reality, several muscles contribute depending on the phase and depth of breathing). 
In summary, option a correctly identifies an action (sternum elevation) associated with thoracic wall movement during inspiration, particularly when accessory muscles are engaged.

ANAT1451-Functional Anatomy & Biomech 1, T2 2025

Which of the following best describes movements of the throracic wall?

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ANAT1451-Functional Anatomy & Biomech 1, T2 2025

Which of the following best describes movements of the throracic wall?

View Explanation

Log in for full answers

Similar Questions

When pressure inside the alveolus exceeds atmospheric pressure _________________.

During the inspiratory portion of a respiratory cycle, the airway resistance is reduced because the distending force exerted by the positive Blank ______ pressure keeps the smaller airways that lack cartilage from collapsing.

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During heavy breathing, expiration through the lungs is _____. During normal breathing expiration is _____.

下列哪项最能描述胸壁的运动？

The work of breathing is described as the total work required to move the chest wall and expand the lungs. Which of the following factors does not contribute to the work of beathing?

Which of the following statement most accurately describes the relationship between the contracting muscles, the pressure or resistance change, and the movement of air during quiet breathing in a healthy individual.

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