Download THE CIRCULATORY SYSTEM

THE CIRCULATORY
SYSTEM
FUNCTION
• The circulatory system is an organ system that passes
nutrients, gases, hormones, blood cells… to and
from cells in the body to help fight diseases and help
stabilize body temperature and pH to
maintain homeostasis.
BLOOD SYSTEM
• The blood system is formed by the blood, the blood
vessels and the heart.
THE BLOOD
•
Is a liquid viscuous, dense and red circulating in the
blood vessels. Is formed by one liquid part called
plasma. In the plasma there are three kinds of cells:
erythrocytes, leukocytes and platelets.
•
The blood carries food, oxygen, cell waste and
hormones.
The blood defends the body.
The blood regulates the body temperature.
•
•
THE PLASMA
• Is a light yellow transparent liquid. In it float the blood
cells.
It’s formed by
• 90% of water
• 7% of proteins
• 3% mixture of molecules
ERYTHROCYTES
• The erythrocytes carry oxygen from the lungs at all the
organs and tissues of the body.
• They are red because they contain hemoglobin.
• The erythrocytes are the most abundant cells of the
body.
• They haven’t got nucleus.
LEUKOCYTES
•
•
•
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The leukocytes are blood cells with nucleus and they
are bigger than the erythrocytes.
Their function is defend the body.
There are three types of leukocytes:
Granulocytes
Lynphocytes
Monocytes
PLATELETS
• They are much smaller than the leukocytes and the
erythrocytes and they haven’t got nucleus.
• The mission of the platelets is the coagulation of the
blood when a blood vessel brokes.
BLOOD VESSELS
• Arteries: they’re the vessels that transport the blood
from the heart to the organs.
• Veins: they’re the vessels that transport the blood from
the organs to the heart.
• Capillaries: they’re the vessels that join the arteries
with the veins.
THE HEART
• The heart is an organ that pumps the blood through
the circulatory system. It allows the blood is always in
movement. It’s formed by the myocardial, a cardiac
muscular tissue. The heart is made up of four
chambers, the two large are the ventricles and the
other two are called auricles. They are connected by
valves.
• Tricuspid valve.
• Mitral valve.
CIRCULATION CIRCUIT
There’re two types of circuits:
- Pulmonary: this circuit leads the blood to the lungs for
oxygenate it.
- Systemic: this circuit sends the blood filled of oxygen
and nutrients to all the cells of our body.