Psychology Wiki   34,115pages on this wiki    The human lungs
flank the heart and great vessels in the chest cavity.[1]
LifeartistAdded by Lifeartist Air enters and leaves the lungs
via a conduit of cartilaginous passageways—the bronchi and
bronchioles. In this image, lung tissue has been dissected away
to reveal the bronchioles[1]      Mammalian lungs Edit  Further
information: Human lung   Breathing is largely driven by the
muscular diaphragm at the bottom of the thorax. Contraction of
the diaphragm pulls the bottom of the cavity in which the lung
is enclosed downward, increasing volume and thus decreasing
pressure, causing air to flow into the airways. Air enters
through the oral and nasal cavities; it flows through the larynx
and into the trachea, which branches out into the main bronchi
and then subsequent divisions. During normal breathing,
expiration is passive and no muscles are contracted (the
diaphragm relaxes). The rib cage itself is also able to expand
and contract to some degree, through the acti