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The Diaphragm

A brief on the human diaphragm

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The Diaphragm

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  1. “The Diaphragm”: Its Functions and Significance

  2. Basic Facts • The primary muscle involved in the respiratory process • Located at the base of the thorax • A dome- or “C”-shaped structure • A “sheet of muscle” that runs laterally through the lower ribs (ribs 6 to 12) • Separates the abdominal cavity from the thoracic cavity • Also called the thoracic diaphragm

  3. Remember: • The term “the diaphragm” refers to the “thoracic diaphragm” • It is not to be confused with the urogenital diaphragm or the pelvic diaphragm

  4. Some Lesser-Known Facts • The human diaphragm is slightly asymmetric • The right diaphragm is located slightly higher to accommodate the liver • The left diaphragm is located slightly lower, possibly to accommodate the heart • Only mammals have diaphragms • Amphibians and reptiles only have diaphragm-like structures

  5. Functions of The Diaphragm • Its location at the base of the thorax allows it to increase the chest cavity volume • By contracting and flattening out, the diaphragm … • enlarges the thoracic cavity • reduces intrathoracic pressure • increases the chest’s vertical dimension • and decreases air pressure in the thoracic cavity

  6. The Importance of Contraction • During contraction, the diaphragm pushes downward • This in turn pushes the pleura—a membrane that surrounds the lungs—upward • Which results in a drop in pleural and alveolar pressure • This process expands the lungs and increases its airflow

  7. Other Essential Functions • The diaphragm is also involved in non-respiratory processes, such as … • childbirth • the prevention of acid reflux • and the expulsion of vomit, feces, and urine

  8. Diaphragmatic Breathing • Also known as “deep breathing” • The scientific term for deep breathing is “eupnea” • The most natural and relaxed form of breathing performed by all mammals • Performed by mammals in a state of relaxation • Deep breathing can improve human health • Commonly performed by yoga practitioners

  9. Benefits of Diaphragmatic Breathing • Alleviates asthma • Improves pulmonary function • Strengthens respiratory muscles • Enhances cardiorespiratory fitness • Increases the length of respiratory muscles

  10. Resources and Questions • More about the diaphragm’s role in breathing • Terms that apply to the backside of the body in the anatomical position include: • a) ventral;anterior • b) back;rear • c) posterior;dorsal • d) medial;lateral

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