Heart Anatomy1

Duration: 3 minutes and 29 seconds

Country: United Kingdom

Language: English

License: CC - Attribution Non-commercial No Derivatives

Genre: Instructional

Views: 285 (63 embedded)

Posted by: lolaceituno on Sep 18, 2009

Description of the function of heart and its parts.

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About the size of your fist, the human heart is the most important muscle in the body.
It can beat more than 100,000 times a day.
pumping about 2,000 gallons of blood
through a 60,000 miles network of vessels in the body
The human heart is made up of four major chambers:
The right side of the heart receives blood
that is low in oxigen from veins all over the body.
It then comes the blood through the pulmonary arteries
into the lungs where they become reoxigenated.
The left part of the heart receives this oxigen-rich blood from the lungs
then it pumps the blood through the aorta
back up to the rest of the body through a complex network
of arteries, arterials and capillaries.
While blood is circulating through the body
it delivers oxigen and nutrients to tissue through the capillaries
and at the same time picks up carbon dioxide and other waste materials.
The veins return the dioxigenated blood to the right atrium
and the cycle begins again.
The heart has four valves
Each valve is like a one-way door
that keeps the blood in the heart flowing in the same direction.
The valves are made up of two or three small but strong flaps of tissue
called leaflets.
Leaflets open to allow blood to flow through the valve
and close to prevent blood from flowing backwards.
The opening and closing of the valves is controlled by blood pressure changes
within each heart chamber.
The tricuspid valve is positioned in the heart's right side
between the right atrium and right ventricle.
The pulmonic valve separates the right ventricle
from the pulmonary artery.
The mitral valve is positioned in the heart's left side
between the left atrium and the left ventricle.
The aortic valve separates the left ventricle
from the aorta.
As blood circulates through the heart
some of the blood flows into much smaller blood vessels
that provide blood directly to the heart.
These arteries called coronary arteries
surround or crown the heart
These separate circulatory system called
coronary circulation
keeps the heart nourished and oxigenated
The two main branches of the aorta that nourish the heart are the
right and left main coronary arteries
Coronary artery disease, which occurs when there is a build up of cholesterol plaque
affects the arteries of this circulatory system
and causes a decrease in blood flow to the heart muscle
resulting a possible damage to the heart or a heart attack.
The beating of the heart which at its rythm is regulated by electrical impulses
generated by your heart muscle.
These impulses begin in the Sinoatrial node
and cause your heart to contract.
Sometimes the Sinoatrial node is also refered to as your heart's natural pacemaker
since it keeps your heart beat constant and consistent
The impulses then travel to the Atrioventricular node
where the signal is checked and then sent through the ventricles
what causes them to contract.
Your heart rate can change based on external conditions
such as diet, exercise, stress or even hormonal factors.

Heart Anatomy1

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