Transcript CIRCULATORY SYSTEM

CIRCULATORY
SYSTEM
THE HEART
CIRCULATORY SYSTEM
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BLOOD
BLOOD VESSELS
HEART
The flow of blood through your heart is simple to
understand. First the blood flows through your right
atrium and then through your left ventricle. Next, it
flows to the lungs and receives oxygen. After the
blood is oxygen rich, it travels back to the heart but
on the left side this time. It enters the atrium, flows
to the ventricle and is pumped to the upper and
lower body. When the blood is pumped through the
rest of the body it gives the cells oxygen and picks
up the carbon dioxide. The blood then travels back
to the heart and does the cycle all over again. It
takes less then a minute to take that trip.
Some things that are important about the heart are that
arteries take the blood from your heart to your lungs if it
is oxygen poor. If not then the blood goes all over your
body. Also veins bring the blood make to your heart. The
average adult’s heart is 14cm long and 9cm wide.
The structure of the heart is simple
to understand.There are four
chambers in the heart. They are the
left atrium, left ventricle, right
atrium, and right ventricle. The heart
is a strong muscle. This muscle is
called the Cardiac Muscle and it
never gets tired. Valves in your heart
are there so your blood does not
flow backwards.
BASIC HEART STRUCTURE
ANIMAL HEART
 ATRIUM
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RECEIVE BLOOD RETURNING TO HEART
VENTRICLES
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PUMP BLOOD FROM THE HEART
BASIC HEART STRUCTURE
ANIMAL HEART
 ARTERIES
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CAPILLARIES
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CARRY BLOOD FROM THE HEART
SITE OF GAS AND NUTRIENT EXCHANGE
VEINS
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RETURN BLOOD TO THE HEART
FUNCTIONS OF THE HEART
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TWO MAJOR DIVISIONS
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PULMONARY CIRCUIT
‫الدورة الرئوية‬
CARRIES BLOOD TO LUNGS (GILLS)
 GAS EXCHANGE: LOSE CO2, GAIN O2
 RIGHT SIDE OF MAMMALIAN HEART
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SYSTEMIC CIRCUIT
‫الدورة الجسدية‬
CARRIES BLOOD TO BODY ORGANS
 GAS EXCHANGE: LOSE O2, GAIN CO2
 LEFT SIDE OF MAMMALIAN HEART
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