Posted by: vmbhonde | जुलै 10, 2011

THROUGH HUMAN HEART

AMAZING JOURNEY THROUGH

AMAZING JOURNEY THROUGH
AMAZING JOURNEY THROUGH HUMAN HEARTMAN HEART
DINESH VORAUMAN HEART
DINESH VORA
 
file://heart/
Let’s get straight to the heart of the matter–
the heart’s job is to move blood.
Day and night, the muscles of your heart contract
and relax to pump blood throughout your body.
When blood returns to the heart, it follows a
complicated pathway. If you were in the
bloodstream, you would follow the steps below
one by one.
 
1. Oxygen-poor blood (shown in blue) flows from
the body into the right atrium.
 
2. Blood flows through the right atrium into the right ventricle.
 
3. The right ventricle pumps the blood to the lungs,
where the blood releases waste gases and
picks up oxygen.
  
4. The newly oxygen-rich blood (shown in red)
returns to the heart and enters the left atrium.
 
5. Blood flows through the left atrium into the left
ventricle.
 
6. The left ventricle pumps the oxygen-rich blood
to all parts of the body.
 
file://dinvora/
 
    Do right and left seem backward? That’s because
you’re looking at an illustration of somebody else’s
heart. To think about how your own heart works,
imagine wearing this illustration on your chest.
 
    Sure, you know how to steal hearts, win hearts,
and break hearts. But how much do you really know
about your heart and how it works? Read on to
your heart’s content.
 
    Put your hand on your heart. Did you place your
hand on the left side of your chest? Many people do,
but the heart is actually located almost in the center
of the chest, between the lungs. It’s tipped slightly
so that a part of it sticks out and taps against the
left side of the chest, which is what makes it seem
as though it is located there.
 
    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.
 
    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.
 
    Feel your pulse by placing two fingers at pulse points
on your neck or wrists. The pulse you feel is blood
stopping and starting as it moves through your
arteries. As a kid, your resting pulse might range
from 90 to 120 beats per minute. As an adult, your
pulse rate slows to an average of 72 beats per
minute.
 
    The aorta, the largest artery in the body, is almost
the diameter of a garden hose. Capillaries, on the
other hand, are so small that it takes ten of them
to equal the thickness of a human hair.
 
    Your body has about 5.6 liters (6 quarts) of blood.
This 5.6 liters of blood circulates through the body
three times every minute. In one day, the blood
travels a total of 19,000 km (12,000 miles)–
that’s four times the distance across the
US from coast to coast.
 
    The heart pumps about 1 million barrels of blood
during an average lifetime–that’s enough
to fill more than 3 super tankers.
 
    Lub-DUB, lub-DUB, lub-DUB. Sound familiar? If you
listen to your heart beat, you’ll hear two sounds.
These “lub” and “DUB” sounds are made by
the heart valves as they open and close.
 
AMAZING JOURNEY THROUGH HUMAN HEART   by   Dinesh Vora
 
 Rajendra Shukla” <surajendra001@gmail.com    9-10-2010

AMAZING JOURNEY THROUGH
HUMAN HEART
DINESH VORA

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