下列哪项最能描述胸壁的运动？

Question

下列哪项最能描述胸壁的运动？

BlackTom AI · Accepted Answer

Question restatement: Which of the following best describes the movement of the chest wall?

Option a: 一个。胸锁乳突肌可导致胸骨抬高
Reasoning: The sternocleidomastoid can elevate the sternum during inspiration, which contributes to the expansion of the anterior-posterior diameter of the chest wall. This directly describes a mechanism by which the chest wall moves during breathing, making it a plausible best description.

Option b: 横膈膜下压会导致胸壁扩张
Reasoning: The diaphragm contracting and moving downward (decreasing intrathoracic pressure) increases thoracic volume and leads to chest expansion. While this is true for chest mechanics, it emphasizes diaphragmatic movement rather than the chest wall itself; the question asks about chest wall movement, so this description is less directly about the chest wall and more about the overall thoracic expansion driven by the diaphragm.

Option c: 胸肋关节阻止肋骨向前移动
Reasoning: This statement is incorrect. The costosternocostal (rib-sternum) joints allow some movement; they do not “prevent” ribs from moving forward. In fact, rib movement is part of chest wall expansion, not restriction.

Option d: 桶柄运动涉及胸骨的抬高
Reasoning: Bucket-handle movement describes lateral (transverse) expansion of the rib cage as the lower ribs move outward, increasing the transverse diameter. It does not primarily involve elevating the sternum itself, so this option misattributes the motion to the sternum.

Option e: 例如泵柄运动仅有助于用力呼气
Reasoning: Pump-handle movement refers to the anterior-posterior expansion of the chest during inspiration through elevation of the sternum and upper ribs. This option incorrectly limits pump-handle movement to forcible expiration, which is false because pump-handle action facilitates inspiration, not expiration.

下列哪项最能描述胸壁的运动？单项选择题

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