The circulatory system is made up of the blood, blood
vessels, and the heart. The circulatory system pumps and carries
blood throughout the body.
Blood is made up of liquid and solid parts. The
solid part is made up of white blood cells, red blood cells, and
platelets. White blood cells help the body fight infection and
disease. Red blood cells are smaller than white blood cells.
They carry the oxygen. There are more red blood cells than white
blood cells in the blood. Platelets are tiny bits of cells that are
carried around in the blood. They help stop bleeding.
Platelets clog the openings in blood vessels caused by cuts. They
start the healing process by forming a blood clot, which will then scab as the body
begins to heal itself.
The liquid part of the blood is called plasma. It
is thin and clear. Oxygen and nutrients from the digestive system
are dissolved in the plasma and carried to where it is needed.
Plasma also dissolves wastes from the cells.
Directions: Answer the questions about blood.
Blood is made up of
and solid parts
The solid part of the blood is made up of red and
white blood cells, and
cells help the body fight infection and disease.
cells carry oxygen.
cells are smaller than
The liquid part of blood is called
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