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The heart is a centralized organ in vertebrates which is the primary mechanism of circulating blood. It is composed of a special type of muscle tissue, cardiac muscle, which is only found in the heart. Heart disease is the number one cause of death amongst Americans. Enlarged hearts can result from exercise or disease. A wide range of ailments can affect the heart, including Kawasaki Disease and Cardiomyopathy. Mammals and birds have four chambers, amphibian hearts have three, and fish hearts have only two.
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Fast Facts
- Heart disease is the top cause of American deaths Cardiovascular disease 101
- Hearts can have two, three, or four chambers
- In a lifetime, they beat up to 3.5 billion times Anatomy Of The Heart
- Cardiovascular exercise is specifically designed to help strengthen the heart
- The mass of a normal adult human's heart is 9-12 oz (250-350 grams) Anatomy Of The Heart
- A common earthworm has 5 hearts
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Structure
The human heart is separated into four chambers, two which operate to pump deoxygenated blood to the lungs (where they absorb oxygen), and two which operate to pump oxygenated blood to all the other tissues of the body. Deoxygenated blood enters the right atrium, moves to the right ventricle, and then is moved to the lungs. From the lungs, it passes to the left atrium, then moves to the left ventricle, then is pumped to the rest of the body. Once the body has absorbed the oxygen, the blood enters the heart and begins the cycle anew. -
Related Pages on Mahalo
Blood | Circulatory System | Human Anatomy | Lungs | Muscle | Kawasaki Disease | Sneezing | Anticoagulant
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How Stuff Works: Heart
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Kidshealth.org: Heart
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Franklin Institute: The Human Heart
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American Heart: Homepage
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ThinkQuest.org: Interactive Heart
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Wikipedia: Heart
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How Stuff Works: Heart
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Heart on Twitter Powered by Twitter
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"Let us dream of tomorrow where we can truly love from the soul, and know love as the ultimate truth at the heart of all creation. "
@xLalaLoveLovato | November 08, 2009 06:53 AM -
Evan listened to Tom Petty and the Heartbreakers – Listen To Her Heart: http://bit.ly/sb12n
@evansbadtaste | November 08, 2009 06:53 AM -
@valoriesays made HEART Jello!! :D http://twitpic.com/oqcho
@AggieStephanie | November 08, 2009 06:53 AM -
he just only can say like that for you .. not comparable to me, if you can open the eyes of your heart.
@tonnyabdmuis | November 08, 2009 06:53 AM -
@anoukteeuwe Hey! What's wrong sweetie? Are you ok? I think you have the most beautiful heart in the world. Take care ok! Biiiiiiiiig hug! x
@WendyVermeren | November 08, 2009 06:53 AM
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Heart on Amazon | View All
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Straight from the Heart - $9.98
Studio: Gaiam Americas Release Date: 05/01/2007 Run time: 88 minutes
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Sterling Silver Marcasite & Garnet Glass Heart Pendant, 18" - $70.00
Project an air of mystery and allure with this captivating glass heart pendant. The red glass heart is held in an ornate sterling silver setting, with vine-like filigree design of the silver backing visible through the glass. Tendrils of ro...
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Lekue Silicone Ice Cube Tray, Heart - $4.99
Lekue Fancy Shapes trays are made out of FDA approved recyclable rubber. They are ideal for making cool shaped ice cubes and also for molding gelatin for fun snacks. Non-stick and bendable, ice cubes pop right out and Lekue ice cube trays...
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Sgt. Pepper's Lonely Hearts Club Band (Remastered) - $18.98
The classic original Beatles studio albums have been re-mastered by a dedicated team of engineers at Abbey Road Studios in London over a four year period utilising state of the art recording technology alongside vintage studio equipment, ca...
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Questions and Answers About Heart | View All | Ask a Question
View All Heart Questions (245) | Ask a QuestionDid DJ Unk really have a heart attack? (2 Answers)DJ Unk, Rapper from Atlanta that has the song Walk It Out, is 26 years old and had a heart attack the other day. He tweeted to all his fans ... read moreWhen the ventricles in the heart contract, where is blood pumped to? (1 Answer)From http://your-doctor.com/healthinfocenter/medical-conditions/cardiovascular/heartpump-tutorial.html "Blood returning to the heart from the body (venous blood that has already had oxygen taken from it) enters the right atrium. Blood flows and is pumped from ... read moreHow to win filipina heart? (1 Answer)OMG I'm a filipina :) So I know. Well of course there are lots of kinds of personalities but as a filipina I know some of the qualities that will ... read more
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Heart Wellness
- WebMD: Heart Health Center
