Download Organs of our body

Organs of our body
By Ayman
Class 3
Pancreas
The pancreas /ˈpæŋkriəs/ is
a gland organ in the digestive
system and endocrine
system of vertebrates. It is
both an endocrine
gland producing several
important hormones,
including insulin, glucagon, so
matostatin, and pancreatic
polypeptide, and a digestive
organ, secreting pancreatic
juicecontaining digestive enzy
mes that assist the absorption
of nutrients and the digestion
in the small intestine.
These enzymes help to further
break down
the carbohydrates, proteins,
and lipids in the chyme.
Brain
The human brain is the center
of the human nervous system. It
has the same general structure
as the brains of other mammals,
but is larger than expected on
the basis of body size among
other primates.[1][2] Estimates
for the number
of neurons (nerve cells) in the
human brain range from 80 to
120 billion.[2][3] Most of the
expansion comes from
the cerebral cortex, especially
the frontal lobes, which are
associated with executive
functions such as self-control,
planning, reasoning, and
abstract thought. The portion of
the cerebral cortex devoted to
vision is also greatly enlarged in
human beings, and several
cortical areas play specific roles
in language, a skill that is
unique to humans.
Lungs
The lung is the
essential respiration organ in
many air-breathing animals,
including most tetrapods, a
few fish and a few snails.
In mammals and the more
complex life forms, the two
lungs are located near the
backbone on either side of
the heart. Their principal
function is to
transport oxygen from
theatmosphere into
the bloodstream, and to
release carbon dioxide from the
bloodstream into the
atmosphere. This exchange of
gases is accomplished in the
mosaic of specialized cells that
form millions of tiny,
exceptionally thin-walled air
sacs called alveoli.