The Heart
By Heart Attack & Co.
This power point is only to teach people about the heart, and not to intimidate or to
hurt anyone or anything. Heart Attack & Co. asks for comments that are respectful
and does not insult anyone or anything. You also may not copy this power point and
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Viewer Discretion: Some viewers may feel disturbed by a few pictures in the power
point that include the heart.
Please enjoy this power point.
-Heart Attack & Co.
The Heart
The heart is practically a pump. A
group of cells, known as the
pacemakers, send signals to the
heart to make it contract. When
the heart contracts, the blood is
pumped into the circulatory
system. The heart beats about a
100 times a minute, 100,000
times a day, and 36.5 million
times a year. In the next few
slides, they will talk about the
parts of the heart that you see on
the right of this slide.
Blood Vessels Part 1: Arteries and Veins
Blood vessels are elastic tubular
channels that circulate the blood
throughout the body. Arteries,
such as the aorta, are blood
vessels and they carry the blood
away from the heart and to the
rest of the body. The aorta is
largest and one of the major
arteries. Veins are also blood
vessels and they carry the blood
to the heart. Normally when you
go for checkups, the nurse would
check your pulse. Your pulse is
when your arteries are expanding
to let the blood flow. Checking
your pulse makes sure that your
blood flow in normal.
Blood Vessels Part 2: Capillaries
Capillaries are also blood vessels and they connect arteries with veins.
Capillaries branch out, as you can see in the picture above; they branch
out from the arteries then go towards the veins. Capillaries help bring
blood back to the heart.
Atria
The heart consists of two
chambers, an upper chamber and
a lower chamber. The upper
chambers are called atria, which
is plural for atrium. Atria receives
blood that comes into the heart.
There is a right atrium and a left
atrium. The right atrium receives
blood that is high in carbon
dioxide and is low in oxygen. The
left atrium receives blood that is
high in oxygen and is low in
carbon dioxide.
Ventricles
The lower chambers are called ventricles. The ventricles pump the blood out of the
heart. The right ventricle pumps the oxygen-poor blood into the lungs, and the left
ventricle pumps oxygen-rich blood into the lungs.
Valves
The atria are separated from the ventricles by valves. The atria sends the
blood through the valves and the valves send it to the ventricles. The
valves also prevent the blood from flowing backwards.
EKG
Electrocardiogram (EKG or ECG) is a test that measures the electrical activity of the
heart. With each beat, an electrical impulse moves through the heart. This electrical
impulse causes the muscle to squeeze and pump blood from the heart.
“Lub-Dup”
Have you ever used a stethoscope to listen to your heart? Did you hear the
beating sound that sounds a lot like “lub-dup”? The heart makes the “lub-
dup” sound every second of your life. When the contraction of the valves
between the atria and ventricles closes, it makes the “lub” sound. When
the valves between the ventricles and the blood vessels closes, it creates
the “dup” noise.
The Heart
Now that you have read about the heart, let’s see if you can label some
parts of the heart.