Kw-logo-smaller

The Ins and Outs of the Heart

Your heart is about the size of your fist.
The Human Heart

When most peeps think of the word "heart" they think of love, romance and all that mushy stuff. Those things are great and all, but let's also give your heart props for what it really is - an amazingly powerful life-sustaining organ.

Pump Up the Oxygen

To put it simply, your heart is a pump. Much like that gizmo in your fish tank, your heart moves liquid from one place to another. In the process, the heart re-oxygenates the blood moving through it with the oxygen you breathe in. This is an essential process cuz your blood supplies oxygen to your entire body. If you don't get oxygen for more than a few minutes, you'll die.

Basic Anatomy

Your heart is a cone-shaped muscle in the middle of your chest, right between your lungs. The average adult heart weighs between 9 - 10.5 ounces (255 - 298 grams) and it pumps about 1,900 gallons (7,200 liters) of blood every day. The heart has three layers: the endocardium (outside layer), the myocardium (middle layer) and the pericardium (the fluid sack that surrounds the heart). The heart is also divided up into four chambers, which each have a valve that allows blood to flow in, but prevents blood from flowing backwards.

The Human Heart

In Action

The heart squeezes blood out and into the rest of the circulatory system when it contracts. When it expands, it sucks in poorly oxygenated blood and pushes through the chambers and into the pulmonary artery, where it is re-oxygenated. Then the blood makes its way out of the heart via the aorta and back into the body where it provides your cells with oxygen.

The Human Heart

Did U Know?

  • In the average person's life, their heart will beat 2.5 billion times.
  • Heart disease is the leading cause of death in North America. More than 2,000 Americans die from heart disease everyday.
  • Your heart is about the size of your fist.
Related Stories
>
>

readers voted!

Comments

Shadeleaf

Shadeleaf wrote:

Hello then *sharps blade on the nearest tre* Oh yeah,
commented: Wed Jan 08, 2014

Keekeow

Keekeow wrote:

* Giggles madly * I love when the heart beats in my hand! * snaps * SORRY im back
commented: Wed Jan 08, 2014

Shadeleaf

Shadeleaf wrote:

So sciencey... I want more.... *evil sly grin with a hidden smirk*
commented: Wed Jan 08, 2014

there are 15 more comments

Please login or register to add comments

share with your friends


Twitter Facebook Myspace Digg


like this article?
get more just like it in your email

Poll

What Causes Heart Disease?

  • Genetics.
  • Eating too many high-fat foods.
  • Smoking.
  • All of the above.

related stories

Micro_love_micro
Shay asks: “Love? Is that a real thing, or not? I looked it up in the dictionary, and there was n...
Micro_dating_micro
NSN678 asks: "I asked someone to go out with me and I don't know if we are cause he's giving all ...
Micro_friend_micro
sakotako asks: "I have this HUGE crush on this guy in my class. He’s been my friend for a really ...

latest videos

Random in the forums

kingoftheworld100
"I am epic" wrote:so lol i guess
reply 18 minutes
chelsofody
"Seth100" wrote:I really like this post it make people find out and think to themselves who they really are in life Thanks so much!! 
reply 21 minutes
mey-rin
mey-rin posted in New Users:
ey there everyone! im lili, but you can call me doll :D uhm, im female, 14 years old, and i rlly like all different kinds of anime, like black butler, dangan ronpa and dangan ronpa 2, attack on titan, and mushishi. the black butler manga is my favorite ahh. i also like swimming, outer space, being in the forest, and the smell after rain. if you have read "the little prince" by antoine de saint-exupery you should let me know cuz thats my favorite book!!! soooo yeah dont be afraid to talk to me! i hope to make more friends on here and be active uwu
reply 28 minutes
amberdawg10
amberdawg10 posted in Debating:
I think Hunger Games is the best movie ever. What do you think?
reply about 1 hour
RawrImacat
RawrImacat posted in General:
The AFTERMATH: The letters are just everywhere. Children are forgetting the alphabet, teachers have gone mad, and patents are confused. BUT WE SAVED THE QUEEN!
reply about 1 hour

play online games

Candy-100

A great online version of the famous Candy Crush. This is the best game launched...

1515_gl_kidzworld_100x100_jpg_fz

Intriguing planets, weird and wonderful characters; challenge friends and find a...

100x100_ra_logo_girl

Uncle George has left you his farm, but unfortunately it’s in pretty bad shape. ...

_thumb_100x100

Shoot blobs with different properies to merge yellow blobs. Your blobs can be re...

_thumb_100x100

We have all played the famous game Sudoku, now play it online with this Classic ...