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31 Αυγ 2023 · Breathing is one of the four components of respiration, the other three being gas diffusion, gas transport and regulation. The pathway towards the lungs is provided by airways and together, these components form the respiratory system, which is located inside the thoracic or chest cavity.
The muscles of respiration are also called the 'breathing pump muscles', they form a complex arrangement in the form of semi-rigid bellows around the lungs. All muscles that are attached to the human rib cage have the inherent potential to cause a breathing action.
The major mechanisms that drive pulmonary ventilation are atmospheric pressure (Patm); the air pressure within the alveoli, called alveolar pressure (Palv); and the pressure within the pleural cavity, called intrapleural pressure (Pip). Mechanisms of Breathing.
16 Ιουλ 2023 · Process of Passive Expiration. Expiration is the phase of ventilation in which air is expelled from the lungs. It is initiated by the relaxation of the inspiratory muscles: Diaphragm – relaxes to return to its resting position, reducing the superior/inferior dimension of the thoracic cavity.
31 Οκτ 2023 · During the process of inhalation, the lung volume expands as a result of the contraction of the diaphragm and intercostal muscles (the muscles that are connected to the rib cage), thus expanding the thoracic cavity.
30 Ιουλ 2022 · In general, two muscle groups are used during normal inspiration: the diaphragm and the external intercostal muscles. Additional muscles can be used if a bigger breath is required. When the diaphragm contracts, it moves inferiorly toward the abdominal cavity, creating a larger thoracic cavity and more space for the lungs.
15 Μαρ 2020 · The key anatomical structures involved in ventilation include: Lungs. Diaphragm. Rib cage. External intercostal muscles. Inspiration is the process of transporting air into the lungs. During inspiration: the diaphragm contracts, allowing the lung bases to expand.
