This human body system is
responsible for the digestion of
foods and absorbing the nutrients
from foods. Its main parts include
the mouth, esophogus, stomach,
large and small intestine and the
This system performs six major
functions; support, movement,
protection, production of blood
cells, and storage of ions and
endocrine regulation. The adult
body has 206 bones.
This system is
responsible for the
movement of the human
body. Attached to the
bones are about 700
named muscles that
make up roughly half of a
person’s body weight.
Each of these muscles is
a discrete organ
constructed of skeletal
muscle tissue, blood
vessels, tendons, and
This system is responsible for
taking in oxygen and expelling
carbon dioxide.
The lungs carry out this
exchange of gasses as we
breathe. Red blood cells
collect the oxygen from the
lungs and carry it to the parts
of the body where it is
This is a system of sex organs within an organism which work
together for the purpose of reproduction.
This system is an organ
system consisting of the skin,
hair, nails, and exocrine
glands. The skin is only a few
millimeters thick yet is by far
the largest organ in the body.
Skin forms the body’s outer
covering and forms a barrier
to protect the body from
chemicals, disease, UV light,
and physical damage.
This system consists of the
brain, spinal cord, sensory
organs, and all of the
nerves that connect these
organs with the rest of the
body. Together, these
organs are responsible for
the control of the body
and communication among
its parts. The brain and
spinal cord form the
control center that relays
information to the rest of
the body.
This system is the collection
of glands that produce
hormones that regulate
metabolism, growth and
development, tissue function,
sexual function, reproduction,
sleep, and mood, among
other things.
Also known as the cardiovascular
system. It consists of the heart,
blood vessels, and the
approximately 5 liters of blood
that the blood vessels transport.
Responsible for transporting
oxygen, nutrients, hormones, and
cellular waste products
throughout the body, the
cardiovascular system is powered
by the body’s hardest-working
organ — the heart
This system consists of the kidneys,
ureters, urinary bladder, and urethra. The
kidneys filter the blood to remove wastes
and produce urine. Besides filtering and
eliminating wastes from the body, this
system also maintains the homeostasis of
water, ions, pH, blood and pressure.