Which muscle is NOT directly involved in the process of changing the volume of the thoracic cavity?
Understand the Problem
The question is asking to identify which of the listed muscles does not play a direct role in altering the volume of the thoracic cavity, which is crucial for respiration. This involves understanding the anatomy and functions of the involved muscles.
Answer
The pectoralis major muscle.
The pectoralis major muscle is not directly involved in the process of changing the volume of the thoracic cavity.
Answer for screen readers
The pectoralis major muscle is not directly involved in the process of changing the volume of the thoracic cavity.
More Information
The muscles primarily responsible for changing the volume of the thoracic cavity are the diaphragm and intercostal muscles. While the pectoralis major muscle is in the vicinity, it is not directly involved in this process.
Tips
A common mistake is assuming that all muscles within the thorax region are involved in respiration. Many muscles, like the pectoralis major, serve different primary purposes, such as moving the arm.
Sources
- Anatomy, Thorax, Muscles - StatPearls - ncbi.nlm.nih.gov
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