Page 190 - The Miracle of the Blood and Heart

THE MIRACLE OF THE
BLOOD AND HEART

blood is transmitted from the right atrium to the right ventri-
cle. Although the chambers in the heart appear different, they
actually perform the same job. Both are charged with pump-
ing the blood to a specific objective.
The systematic functioning of this mechanism is of great
importance because all these processes have to be in order.
And if it goes wrong, the heart will either pump no blood to
the body, or else it will become loaded with too much blood.
In order for this sequence to occur properly, the valves
between the atrium and the ventricle open like a one-way gate
to the flow of blood. When the atria contract, these valves
open and blood enters the ventricles. After this has taken

aorta pulmonary artery
superior vena cava semilunar valves

right atrium pulmonary vein
left atrium
tricuspid valve
mitral valve
inferior vena cava
a)
right ventricle heartbeat
sound
left ventricle
e)
heartbeat
sound
b)
heartbeat
sound

d)
c)

Arrow indicates the direction of the blood flow. When the heart con-
Harun tracts, blood is passed from the atria to the ventricles. The valves
close. As the ventricles contract, blood is pushed out to the
Yahya body.

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