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Slide 1

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Humans (all mammals) have a double circulation.
Blood flows from the right side of the heart into the ?
pulmonary circulation.
After blood is oxygenated in the lungs it returns to the left side
of the heart.
From here it enters the ? systemic circulation.
When the blood passes through the the capillary bed of the lungs
it loses pressure. By passing through the left side of the heart
before continuing around the body the pressure can be increased
allowing the oxygenated blood to reach the organs of the body
The heart is the pump for both these circulations.
next…read more

Slide 2

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Heart diagram exercises.
next…read more

Slide 3

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LV = Left Ventricle
RV = Right Ventricle
LA = Left Atrium
RA = Right Atrium
AS = Atrial Septum
VS = Ventricular Septum
1 = Tricuspid Valve
2 = Right Semi Lunar Valve
3 = Bicuspid Valve
4 = Left Semi Lunar Valve
Blood Vessels
Ao = Aorta
PA = Pulmonary Artery
SVC = Superior Vena Cava
Label the parts of the Heart IVC = Inferior Vena Cava…read more

Slide 4

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The heart is made of cardiac muscle…read more

Slide 5

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Cardiac muscle tissue consists of branched, faintly striated fibres (cells), each of
which contains a centrally placed nucleus.
Thickenings of
the plasma
cardiac muscle
cells form
Cardiac muscle tissue forms networks due to its branching structure.
When one muscle fibre is electrically excited, an impulse is quickly
transmitted to neighbouring fibres such that impulses spread in all directions
when cardiac muscle is stimulated.…read more

Slide 6

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This photomicrograph of cardiac muscle tissue shows the branching nature
of the
the fibres,
fibres, the
the intercalated
intercalated discs
discs and
and the
the nuclei.
disc…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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