QUESTIONS AND ANSWERS VERIFIED
What occurs during normal inhalation?
lungs expand and contract in response to changes in pressure inside the chest cavity
How do the thoracic cavity & diaphragm move during normal inhalation?
thoracic cavity moves up/down, in/out, and diagonal
diaphragm contributes most of the vital capacity ⭐️
& moves up/down
What is the function of the scalenes during normal inhalation?
stabilize rib cage and prevent downward rib motion
What is the function of the intercostals during normal inhalation?
elevate ribs during deep inspiration and prevent retractions
Where does the diaphragm move when you inhale?
moves down & contracts, increases thoracic cavity space allowing more air to come in
Where does the diaphragm move when you exhale?
moves up
What occurs during normal exhalation?
passive recoil
What occurs during forced expiration?
, ribs are drawn downward and the diaphragm is pushed upward
active motion
What is the primary muscle of exhalation?
abdominals - push on diaphragm and pushes air up & out
What is the function of the intercostals during normal exhalation?
draws ribs closer together - depresses the ribs causing a reduction of the
anteroposterior & mediolateral dimensions of the thoracic cavity
also stiffens the intercostal spaces
T/F: a normal cough can be over 100 mph
apparently so
What are the primary muscles of inspiration?
diaphragm
SCM, scalenes, upper trap
external intercostals
Innervation of diaphragm
C3,4,5
Innervation of accessory muscles (SCM, Scalenes, UT)
C2-C7
Innervation of external intercostals
T1-T11
What are the primary muscles of expiration?