The document discusses four main human body systems - the digestive system, circulatory system, respiratory system, and urinary system. The digestive system breaks down food for absorption and consists of the digestive tract and glands. The circulatory system includes the heart and blood vessels which pump and carry blood around the body. The respiratory system is made up of the respiratory tract and lungs, using the diaphragm during breathing. The urinary system expels waste from the blood through the kidneys, ureters, bladder, and urethra, with some people requiring dialysis if their kidneys do not function properly.
2. The digestive system breaks
down food into substances
that blood can absorb. This
is called digestion.
The digestive system
consists of the digestive
tract and the digestive
glands.
2
THE DIGESTIVE SYSTEM
3. The circulatory system
consists of the heart and
blood vessels.
The heart is the organ
that pumps blood around
the body. Blood vessels
carry blood around the
body. 3
THE CIRCULATORY SYSTEM
4. The respiratory system
The respiratory
system is made up of
the respiratory tract
and the lungs. When
we, inhale our
diaphragm contracts
and moves down.
When we exhale, our
diaphragm and
intercostal muscles
relax.
5. THE URINARY SYSTEM
The urinary system expels the waste
products carried by the blood from the
cells. The urinary system consist of the
kidneys, the ureters, the bladder and the
urethra. Some people´s kidneys do not
work properly so they have to connect
to a dialysis machine to stay healthy.
5
