respiration mechanics Flashcards
what is tidal volume?
the volume of air that inspired or expired with each breath
what is minute ventilation?
the volume of air is inspired or expired per minute
what is breathing/respiratory rate
how many breaths you take in a minute
what is lung volume?
lung volume is the total volume of air that the lungs can hold at one time
what is inspiratory reserve volume?
maximal volume of air inspired in addition to the tidal volume
what is expiratory reserve volume?
maximal volume of air expired in addition to the tidal volume
what is reserve/residual volume?
the volume of air that can never be expired and remains in the alveoli
what is vital capacity?
the volume of air that can be exhaled after maximal inspiration
what is total lung capacity?
vital capacity+reserve/residual volume
what is the thoracic cavity?
the chamber inside the rib cage that contains the heart and lungs
what happens to the ribs during inspiration and expiration?
during INSPIRATION they move upwards and outwatds
during EXPIRATION they move inwards and downwards
what does the diaphragm do during inspiration and expiration?
during INSPIRATION it flattens (goes down) and contracts
during EXPIRATION it relaxes and forms a dome like shape (goes up)
what happens to the volume of the thoracic cavity during inspiration and expiration?
during INSPIRATION the volume will increase so theres more room for air
during EXPIRATION the volume will decrease as its pushing air out
what moves the ribs during inspiration or expiration?
the intercostal muscles contract to move the ribs
what happens to air pressure during inspiration or expiration annd why?
during INSPIRATION the air pressure increases as the volume of the thoracic cavity increases so the air isnt as compact.
also since gases move from high to low concentration air rushes into the lungs as its at lower concentration
during EXPIRATION air pressure decreases as the area of the lungs decreases.
this means the air pressure is more than that outside the body so air rushes out to help equalize the pressure
