Exchange of Gases,Transport of Gases Video Lecture - NEET

err first enters the body through the
mouth or nose and quickly moves to the
pharynx or throat
from there the air passes through the
larynx or voice box and enters the
trachea the trachea is a strong tube
that contains rings of cartilage that
prevent it from collapsing within the
lungs the trachea branches into a left
and right bronchus which further divided
into smaller and smaller branches called
bronchioles
the smallest bronchioles and in tiny air
sacs called alveoli which inflate during
inhalation and deflate during exhalation
gas exchange is the delivery of oxygen
from the lungs to the bloodstream and
the elimination of carbon dioxide from
the bloodstream to the lungs
it occurs in the lungs between the
alveoli and a network of tiny blood
vessels called capillaries which are
located in the walls of the alveoli here
you see red blood cells traveling
through the capillaries
the walls of the alveoli actually share
a membrane with the capillaries that's
how close they are this makes it
possible for oxygen and carbon dioxide
to diffuse or move freely between the
respiratory system and the bloodstream
oxygen molecules attached to red blood
cells which travel back to the heart
at the same time the carbon dioxide
molecules in the alveoli are blown out
of the body with the next exhalation gas
exchange allows the body to replenish
the oxygen and eliminate the carbon
dioxide both of which are necessary for
survival