How the heart works

Duration: 2 minutes and 58 seconds

Country: United States

Language: English

License: CC Attribution Non-Commercial Share Alike

Genre: Instructional

Views: 290 (2 embedded)

Posted by: tonhaco on May 1, 2008

Report this video as offensive

Translate and Transcribe

Sign In/Register for dotSUB to translate this video.

Share

Embed Video
Embed normal player
Embed a smaller player
Advanced Embedding Options
Embedding Options

Size:

Language:

Embed Code
Embed transcript
Embed transcript in:
Invite a user to dotSUB

Your invitation to join dotSUB was successful

There was an error inviting that user to dotSUB

Video Transcription

Show in new window

Your heart is a pump
It's a muscular organ about the size of your fist
and is located slightly left of center in your chest.
Your heart is divided into the right and left side.
The divison protects oxygen rich blood from mixing with oxygen poor blood
Together your heart and blood vessels comprise your cardiovascular system
which circulates blood and oxygen around your body.
In fact, your heart pumps about 5 quarts of blood every minute
and it beats about one hundred thousand times in one day.
That's about thirty five millon times in a year.
Oxygen poor blood, blue blood,
returns to the heart after circulating through your body.
The right side of the heart, composed of the right atrium and ventricle,
collects and pumps the blood to the lungs through the pulmonary arteries.
The lungs refresh the blood with a new supply of oxygen
making it turn red.
Oxygen rich blood, red blood, then enters the left side of the heart
composed of the left atrium and ventricle
and is pumped through the aorta to the body
to supply tissues with oxygen.
Four valves within your heart keep your blood moving the right way.
The tricuspid, mitral, pulmonary and aortic valves
work like gates on a fence:
They open only one way and only when pushed on.
Each valve opens and closes once per heart beat
or about once every second.
A beating heart contracts and relaxes.
Contraction is called Sytole and relaxing is called Diastole
During Systole your ventricles contract
Forcing blood into (the heart before) going to your lungs and body
much like ketchup being forced out of the squeezed bottle
The right ventricle contracts a little bit before the left ventricle does.
Your ventricles then relax during diastole
and are filled with blood coming from the upper chambers
the left and right atria.
Then the cycle starts over again
Your heart is nourished by blood too,
Blood vessels called coronary arteries
extend over the surface of your heart and branch into small capilaries
which fill your heart with oxygen rich blood
Your heart also has electrical wiring which keeps it beating.
Electrical impulses begin high in the right atrium
and travel through specialized pathways to the ventricles
delivering the signal to pump.
The conduction system keeps your heart beating in a coordinated and normal rythm
which in turn keeps blood circulating
The continuous exchange of oxygen rich blood with oxygen poor blood
is what keeps you alive.

How the heart works

Translate and Transcribe

Share

Video Transcription

Other videos from tonhaco