The heart powerpoint

1. ãClare Hargreaves-Norris
Heart
NVQ Level 3 Beauty
Therapy

2. ãClare Hargreaves-Norris
Heart structure
 The heart is a hollow, cone shaped organ with cardiac muscle
forming its walls.
 The heart is approximately 10 cm long and is situated in the
thoracic cavity, behind the sternum, lying to the left side.
 The heart is divided into a right and left side with the
septum separating each side.
 The heart contains four chambers; two upper chambers
called the right and left atriums and two lower chambers
called the right and left ventricles.
 The valves separate the atrium and ventricle chambers and
when they open and close they change the pressure within
the chambers.

3. Contraction and relaxation of the
heart
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When the cardiac muscle
contracts (at systole) it
forces the blood out of
the heart and into the
arteries which carry the
blood around the body.
When the cardiac muscle
relaxes (at diastole) the
heart fills with blood.
This mechanism of
contraction and
relaxation is known as a
heart beat.

4. The sequence the blood flows through
the heart
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1. The oxygenated blood from the lungs
enters into the left atrium of the heart
via the pulmonary veins.
2. The blood is squeezed through the
bicuspid valve into the left ventricle.
3. It is then forced into the body’s largest
artery - the aorta, which transports the
oxygenated blood to the rest of the body.
4. Deoxygenated blood returns from the
body via the superior and inferior vena
cava into the right atrium of the heart.
5. The blood is squeezed through the
tricuspid valve into the right ventricle.
6. It is then forced out into the pulmonary
artery which transports the deoxygenated
blood to the lungs to become oxygenated.
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5. ãClare Hargreaves-Norris
Label your diagram of the heart.

6. Pulmonary & Systemic Circulatory
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Systems
The circulatory
system is divided into
two distinct systems

7. ãClare Hargreaves-Norris
Pulmonary circulation
Pulmonary circulation
transports blood from the
lungs to the heart and back
again. It carries
deoxygenated blood from the
right ventricle of the heart
via the pulmonary artery and
is transported to the lungs.
The lungs enrich the blood
with oxygen and the
pulmonary veins carry the
oxygenated blood back to the
left atrium of the heart.

8. ãClare Hargreaves-Norris
Systemic circulation
Systemic circulation
transports blood from the
heart to the rest of the
body and back again. It
carries oxygenated blood from
the left ventricle via the aorta
to the body organs and tissues.
The aorta then branches off
to supply the various areas of
the body. As the blood travels
around the body, the oxygen is
removed and the blood
becomes deoxygenated. The
superior and inferior vena cava
returns the deoxygenated
blood back to the heart.