Exhalation describes the state when the diaphragm relaxes and intrapulmonic and intrathoracic pressure increases.
Inspiratory muscles such as the diaphragm and external intercostal muscles contract to increase the volume of the thorax. This action lowers the intrathoracic pressure, allowing air to rush into the lungs during inhalation.
When the Diaphragm contracts, it is pulled down, and is pulled back up when it relaxes.Also, when you inhale, it contracts. When you exhale, it relaxes.
During inspiration, the diaphragm contracts, moving downward, and the external intercostal muscles contract, moving the ribcage upward and outward. These actions increase the thoracic volume, causing the intrathoracic pressure to decrease. This decrease in pressure creates a pressure gradient that allows air to flow into the lungs.
The Phrenic Nerve-Diaphragm and the External Intercostal Nerve-External intercostal muscles
The intercostal muscles. Intercostal means "between ribs".
intrathoracic, in mediastinum, anterior to esophagus and posterior to the diaphragm
The end of inspiration is signalled by the relaxation of the diaphragm and the external intercostal muscles. This causes the lungs to passively recoil, leading to expiration.
The diaphragm and external intercostal muscles are primarily involved in changing the thoracic volume during breathing. The diaphragm contracts during inhalation to increase thoracic volume, while the external intercostal muscles help lift and expand the rib cage.
the intercostal muscles and the diaphragm
an exhalation
When you breathe out, or exhale, your diaphragm relaxes and moves upward into the chest cavity. The intercostal muscles between the ribs also relax to reduce the space in the chest cavity.
The diaphragm (a sheet of muscle underneath the ribcage) and intercostal muscles (located between your ribs).