2.1.4 - Mechanics of Breathing

During inhalation:

• The diaphragm contracts & moves upward becoming dome shaped

• The diaphragm contracts & flattens

• The diaphragm relaxes & moves upward becoming dome shaped

• The diaphragm relaxes & flattens

During exhalation:

• The diaphragm contracts & moves upward becoming dome shaped

• The diaphragm contracts & flattens

• The diaphragm relaxes & moves upward becoming dome shaped

• The diaphragm relaxes & flattens

During inhalation:

• The external intercostals contract

• The external intercostals relax

• The internal intercostals contract

• The internal intercostals relax

During exhalation:

• The external intercostals contract

• The external intercostals relax

• The internal intercostals contract

• The internal intercostals relax

When the external intercostals contract:

• The ribcage moves outward & upward

• The ribcage moves outward & downward

• The ribcage moves inward & upward

• The ribcage moves inward & downward

When the internal intercostals contract:

• The ribcage moves outward & upward

• The ribcage moves outward & downward

• The ribcage moves inward & upward

• The ribcage moves inward & downward

When the external intercostals contract, the internal intercostals:

• Contract concentrically

• Contract eccentrically

• Contract Isometrically

• Relax

When the internal intercostals contract, the external intercostals:

• Contract concentrically

• Contract eccentrically

• Contract Isometrically

• Relax

During inhalation:

• Thoracic volume increases

• Thoracic volume decreases

• Thoracic pressure increases

• Thoracic pressure decreases

During exhalation:

• Thoracic volume increases

• Thoracic volume decreases

• Thoracic pressure increases

• Thoracic pressure decreases