![]() Check out this easy to understand visual explanation on Youtube: Boyles Law from Respiratory System – Anatomy & Physiology Online. In physics, this is directly related to Boyle’s Law. This causes a decrease in lung volume and results in increased pressure in comparison to the thoracic atmosphere so that air rushes out of the airway. The rib cage muscles close, returning to resting position.Exhalation: an elastic recoil of the lung tissue occurs.This causes a decrease in lung pressure in comparison to the atmosphere of the thoracic cavity, and air rushes into the airway. The diaphragm sheath muscle descends (contracts).The rib cage muscles are triggered open.Inhalation: The thoracic cavity must expand:.When the brain sends the message, “I need air!” a complex set of activity is triggered: The diaphragm is parachute-shaped, and it descends on inhalation and ascends on exhalation. The upper torso (thoracic cavity) contains the vital organs of the heart and lungs, and the lower torso contains the viscera. Think of the diaphragm muscle as the “divider” of the torso. The diaphragm is an elastic sheath muscle the spans the bottom of the rib cage. The diaphragm is situated at the floor of the thoracic cavity, and it works in unison with the ribs to draw air in and out of the lungs. The ribcage, while structural, is also flexible having tissue and muscles between each rib that function to open and close the ribs. The container is bounded by the ribs (and muscle and tissue). The thoracic cavity can be thought of as a container holding the lungs and heart. There is energy stimulating the folds to vibrate! That energy is in the form of breath! Of course, the vocal folds do not initiate vibration of their own accord. Part 1 of The human voice: an instrument in residence looked at the voice as a localized instrument in the form of the larynx and vocal folds. Voice Specialist, Allegro Choirs of Kansas City Jamea Sale, Director of the Institute for Healthy Associate Director, William Baker Choral Foundation ![]()
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