First Children Encyclopedia

(Marvins-Underground-K-12) #1

Which body system makes your stomach rumble?


Human body


104


Your cells and tissues are


organized into larger body


parts called organs. In turn,


your organs work together


to form body systems.


Organs


An organ is a body part that


does a specific job. Your heart’s


job, for instance is to pump


blood. Kidneys clean blood.


Organizing

the body

Organ transplant
If a vital organ stops working, doctors
may replace it with an organ from another
person. This is called a transplant.

Systems


Organs and


tissues work in


teams to carry out


major tasks, like


transporting blood


or processing food.


These teams are


called systems.


Heart and blood
Your heart, blood, and
blood vessels make up
the blood system. It
transports vital supplies
around your body.

The tubes that carry
blood away from the
heart are called
arteries (shown
in red).

Heart

Kidney

Brain

The heart is the
largest organ in the
blood system. It
pumps blood around
the body.

The tubes that
carry blood back to
the heart are called
veins (shown in
blue).
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