Blood & circulation

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This muscle never stops working It works when
you are asleep It works when you
eat It really works when you exercise. What
is it????
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The HEART
Located between the lungs in the mid thoracic
region
Surrounded by a membrane called the pericardium
Apex points toward the left hip
Composed of cardiac muscle tissue
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The chambers Left Right Atria Left Right
Ventricles
The vessels Pulmonary artery vein Superior
inferior vena cava Aorta
The valves Atrioventricular valves
Tricuspid, Mitral, Semilunar valves Pulmonary
Aortic
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The Valves Allow blood to flow in only one
direction
The pulmonary semilunar valve is the doorway
between the right ventricle and the pulmonary
artery which carries dirty blood to the
lungs The aortic semilunar valve is the doorway
between the left ventricle and the aorta which
carries clean blood to the body
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The Valves Allow blood to flow in only one
direction
The tricuspid valve separates the right atrium
and right ventricle Composed of 3 flaps The
mitral valve (sometimes called the bicuspid
valve) separates the left atrium and left
ventricle Composed of 2 flaps
Valves open as blood is pumped through Held in
place by chordae tendineae (heart strings)
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Aorta leaves left ventricle
Superior vena cava enters right atrium
Pulmonary artery leaves right ventricle
Rt Pulmonary veins enters left atrium
L Pulmonary veins enters left atrium
Inferior vena cava enters right atrium
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The Vessels
Superior Vena Cava Inferior Vena Cava Carry
deoxygenated blood from the upper and lower parts
of the body into the heart
Pulmonary Veins Carry oxygenated blood from the
lungs to the heart
Pulmonary Arteries Carry deoxygenated blood from
the heart to the lungs
Aorta Carries oxygenated blood from the heart out
to the body
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Cardiovascular System A DOUBLE PUMP system
Pulmonary Circuit RA ? RV ? Pulmonary artery ?
capillary beds of the alveoli
Systemic Circuit capillary beds of the alveoli ?
LA ? LV? Aorta ? Body
Functions to deliver oxygen and nutrients and to
remove carbon dioxide and other waste products
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Blood flow thru the Human HEART
Oxygen-poor blood (shown in blue) flows from the
body into the right atrium. Blood flows
through the right atrium into the right
ventricle. The right ventricle pumps the
blood to the lungs, where the blood releases
waste gases and picks up oxygen. The newly
oxygen-rich blood (shown in red) returns to the
heart and enters the left atrium. Blood flows
through the left atrium into the left
ventricle. The left ventricle pumps the
oxygen-rich blood to all parts of the body.
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Lub
Dub
If you listen to your heartbeat, it makes a lub
dub sound.
The lub is when blood is pushed out of the heart
into the body and the dub is the reloading of the
heart with more blood ready to push it out to the
body
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Hold out your hand and make a fist. If you're a
kid, your heart is about the same size as your
fist, and if you're an adult, it's about the same
size as two fists. Your heart beats about
100,000 times in one day and about 35 million
times in a year. During an average lifetime, the
human heart will beat more than 2.5 billion
times.
Heart Facts
Give a tennis ball a good, hard squeeze. You're
using about the same amount of force your heart
uses to pump blood out to the body. Even at rest,
the muscles of the heart work hard--twice as hard
as the leg muscles of a person sprinting. The
human heart can create enough pressure that it
could squirt blood at a distance of thirty
feet. Scientists have discovered that the longer
the ring finger is in boys the less chance they
have of having a heart attack.
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COMPOSITION BOOK

• Cut out diagram of heart
• Label the major vessels
• Label the chambers
• Label the valves
• Color the areas of deoxygenated
• blood blue
• Color the areas of oxygenated blood
• red
• Answer the following
• questions in complete sentences on
• the page below your diagram

• Why is the cardiovascular system referred to as a
  double pump system?
• Where does the systemic circuit go?
• What is the name of the circuit that is
  responsible for oxygenating the blood?