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The Ins and Outs of the 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.
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What Causes Heart Disease?

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

Random In The Forums

jayissocool
jayissocool posted in New Users:
Hey guys (and girls I guess too). My name is Jay I'm 13 and I live in PA. I like videogames especially minecraft and pokemon. I'm mostly on here cus I'm bored but it would cool to make a few new friends online. I actually already talked with one guy on here for a bit who seemed cool. If you want to just hang out and chat let me know. I have to go to bed right now but I'll read it tomorrow morning. Night all  :thumbsup
reply 8 minutes
Pink_Cool_Girl
Exactly!
reply 17 minutes
urifour11
urifour11 posted in Debating:
@rainbowpoptart  You make a very good point. But what I think PCG is trying to say is that maybe someone should consider that some girls don't like pink? Like, I loved playing with doll houses as a kid AND toy cars. But what if someone made a black Barbie house. Like hell yeah I would buy that. Or maybe a pink you car. Wouldn't that be cool? Maybe what I'm trying to get at here is that companies could mix and match their toys together. Use different colors for different items. That would help expand their market much more.  What I'm really impressed though is what Barbie is doing at the moment with making different body types for their dolls. That's awesome right? Anyway, if a girl wants to get a toy car then she can just waltz her way to the boys section and get one. Sure it's kinda disregarding that maybe a girl would like a toy car but man, that's not stopping her from buying that sweet toy car. But what we should really be focusing on is how LEGOS did the sexist thing. WHY ISNT THERE A BATGIRL LEGO SET OR A WONDERWOMAN LEGO SET?!? THATS WHAT IM WAITING FOR AND IM 13 YEARS OLD BUT I WOULD MOST DEFINATLEY BUY ANYTHING REGUARDING WONDERWOMAN. A little off topic. Companies would make more money mixing and matching their toys. Blue toy cars for girls Barbies, a cooking grill for boys. And then there are things that are for both genders like science sets or Doctor kits. In fact I think girls play more with Doctor kits than boys tbh. What one saying is, companies could expand more. 
reply 19 minutes
jayissocool
jayissocool posted in General:
I have to get up at 6am every day to get the bus it horrible  :thumbsdown
reply 36 minutes
EmilyLovesPink
EmilyLovesPink posted in General:
PINK!
reply about 1 hour