Which muscle is responsible for aiding in respiration and sits between the abdomen and the thoracic cavity? Multiple choice diaphragm trapezius muscle sternocieidemastoid muscies

The muscle responsible for aiding in respiration and sitting between the abdomen and the thoracic cavity is the diaphragm. This dome-shaped muscle contracts and flattens during inhalation, increasing the volume of the thoracic cavity and allowing air to flow into the lungs. When it relaxes, it helps push air out during exhalation. Interestingly, the diaphragm is not just important for breathing—it's also linked to our core stability! When it's working efficiently, it helps support the spine and maintain posture, making it a key player in both respiratory health and overall physical performance. So take a deep breath and appreciate your diaphragm!