structure of a heart
TRANSCRIPT
Structure of heart
HEARTThe heart is a four-
chambered muscular organs that pumps blood to all part of the body. It is able to do so by the
rhythmic contraction and relaxation of its muscles. These are known as the heart beats . A normal
heart beats about 60 to 80 times a minute . We can hear our heart beat
with the help of an instrument called
stethoscope.
REAL HEART.
THE FOUR CHAMBERS OF HEART ARE
The right auricle
The left auricleThe right
ventricleThe left
ventricle
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The right auricle opens into the right ventricle and
the left auricle in to
the left ventricle
Right chambers Left chambers
Right auricle
Left auricle
Right ventricle Left ventricle
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As your heart beats and forces blood through your body , you would fell a throbbing sensation at any point where an artery comes close to the surface of your skin , such as wrist ,neck , or upper arm. This throbbing sensation is called the pulse.
PULSE
Counting your pulse rate is
simple way to estimate how fast
your heart is beating .the pulse is often measured
by a doctor as part of physical
examination ,or an emergency, but you can easily
learn to measure your pulse a s
well.
When you exercise , have a fever , or are under
stress , your heart rate usually speeds up to
meet your body’s increased need for
oxygen and nutrients carried in the blood .the
pulse is usually measured after you have rested or
sat quietly for 10 minutes . This measurement is
called resting pulse . The usually resting pulse for
an adult is 50 to 100 beats per minute.
RESTING PULSE.
The walls of the auricles are thinner than those of the ventricles because the auricles have to pump blood into the ventricles ,which is very near. The walls of the ventricles are thicker ,since they have to push the blood to reach the farthest parts of the body .The blood in the right side of the heart remains completely separated from the left side with the help of valves.
Valves separate each of the
chambers which allow blood to flow
only into one direction. Thus ,
there is no mixing of oxygenated
(oxygen-rich) and deoxygenated
(carbon dioxide- rich )blood.
The veins get deoxygenated
blood to the right auricle from all
parts of the body. This blood is
pumped into the right ventricle, which in turns
pumps it into the pulmonary artery
that takes it to the lungs for
oxygenation.
In the lungs carbon dioxide diffuses out into the alveoli and oxygen diffuses in .
The oxygen-rich blood is carried from the
lungs to the heart by the pulmonary vein .
Oxygenated blood enters the left auricle . It is then pumped into
the left ventricle .The left ventricle then pumps the oxygenated
blood to all parts of the body.
THANK YOU.
DONE BY,SUKANYA.P.S
UKESAN7:K