THE STRANGEST THING OF ALL THOUGH, IS THIS…
THE HEART WILL CONTINUE TO BEAT, EVEN IF IT IS BROKEN…
HAPPY VALENTINES…:)

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The heart is a myogenic muscular organ found in all animals with a circulatory system (including all vertebrates), that is responsible for pumping blood throughout the blood vessels by repeated, rhythmic contractions. The term cardiac (as in cardiology) means “related to the heart” and comes from the Greek ??, kardia, for “heart”.

The vertebrate heart is composed of cardiac muscle, which is an involuntary striated muscle tissue found only in this organ, and connective tissue. The average human heart, beating at 72 beats per minute, will beat approximately 2.5 billion times during an average 66 year lifespan, and weighs approximately 250 to 300 grams (9 to 11 oz) in females and 300 to 350 grams (11 to 12 oz) in males.

Human heart
The human heart has a mass of between 250 and 350 grams and is about the size of a fist. It is located anterior to the vertebral column and posterior to the sternum.

It is enclosed in a double-walled sac called the pericardium. The superficial part of this sac is called the fibrous pericardium. This sac protects the heart, anchors its surrounding structures, and prevents overfilling of the heart with blood.

The outer wall of the human heart is composed of three layers. The outer layer is called the epicardium, or visceral pericardium since it is also the inner wall of the pericardium. The middle layer is called the myocardium and is composed of muscle which contracts. The inner layer is called the endocardium and is in contact with the blood that the heart pumps. Also, it merges with the inner lining (endothelium) of blood vessels and covers heart valves.

The human heart has four chambers, two superior atria and two inferior ventricles. The atria are the receiving chambers and the ventricles are the discharging chambers. The right ventricle discharges into the lungs to oxygenate the blood. The left ventricle discharges its blood toward the rest of the body via the aorta.

The pathway of blood through the human heart consists of a pulmonary circuit and a systemic circuit. Blood flows through the heart in one direction, from the atria to the ventricles, and out of the great arteries, or the aorta for example. This is done by four valves which are the tricuspid valve, the mitral valve, the aortic valve, and the pulmonary valve.

In the human body, the heart is usually situated in the middle of the thorax with the largest part of the heart slightly offset to the left, although sometimes it is on the right (see dextrocardia), underneath the sternum. The heart is usually felt to be on the left side because the left heart (left ventricle) is stronger (it pumps to all body parts). The left lung is smaller than the right lung because the heart occupies more of the left hemithorax. The heart is fed by the coronary circulation and is enclosed by a sac known as the pericardium; it is also surrounded by the lungs. The pericardium comprises two parts: the fibrous pericardium, made of dense fibrous connective tissue, and a double membrane structure (parietal and visceral pericardium) containing a serous fluid to reduce friction during heart contractions. The heart is located in the mediastinum, which is the central sub-division of the thoracic cavity. The mediastinum also contains other structures, such as the esophagus and trachea, and is flanked on either side by the right and left pulmonary cavities; these cavities house the lungs.

The apex is the blunt point situated in an inferior (pointing down and left) direction. A stethoscope can be placed directly over the apex so that the beats can be counted. It is located posterior to the 5th intercostal space just medial of the left mid-clavicular line. In normal adults, the mass of the heart is 250-350 g (9-12 oz), or about twice the size of a clenched fist (it is about the size of a clenched fist in children), but an extremely diseased heart can be up to 1000 g (2 lb) in mass due to hypertrophy. It consists of four chambers, the two upper atria and the two lower ventricles.

THE STRANGEST THING OF ALL THOUGH, IS THIS…
THE HEART WILL CONTINUE TO BEAT, EVEN IF IT IS BROKEN…
HAPPY VALENTINES…:)

Digital Art
Photoshop CS5

Special thanx to deviantart.com Stock:
Gossamer_Fractal_Texture_Stock_by_shd_stock

Public Domain Images:
Wikimedia.org (Commons):
491px-Heart_left-highlight_jon_01_svg
394px-Broken_Heart_symbol_svg

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TOP TEN (5) WINNER IN PEACE LOVE AND TRAANQUILITY CHALLENGE “Valentine’s Hearts ~ Peace Love and Tranquility”

I knew I wanted to be an artist at age 4 (Full story: Click on full portfolio, Click on my name)

I am permanently disabled and work at home. Previously, I have been employed as Art Director at California Manufacturers Association and Production Artist at SMW Communications of Sacramento CA.

I studied art at The Academy of Art in San Francisco 1977-79
Mediums:
Oils. Acrylics. Watercolors. Pastels. Inks. Charcoals. Graphites.

Currently I am focused and self taught in Digital Art.

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Comments

  • Kathy Baccari
    Kathy Baccariover 3 years ago

  • THANX KINDLY DEAR KATHY…:)

    – Tammera

  • rodeorose
    rodeoroseover 3 years ago

    OOOOH Tammera- how wonderful——-love your words and this amazing image, and of course…this dreamy old song…XXXXXXXXXXXX

  • AWW, DEAR ROSIE….
    I AM SO GLAD YOU HAVE ENJOYED THIS, GREAT SONG ISNT IT…:)

    – Tammera

  • loiteke
    loitekeover 3 years ago

    Wonderful work

  • FEATURE!!…
    THANX EVER SO MUCH FOR HONORING ME WITH A FEATURE IN THE GROUP…:)

    – Tammera

  • BigCatPhotos
    BigCatPhotosover 3 years ago

    This is really wonderful.

  • THANX KINDLY BCP….:)

    – Tammera

  • eoconnor
    eoconnorover 3 years ago

    LOVELY WORK! lIZ

  • THANK YOU LIZ…:)

    – Tammera

  • LoneAngel
    LoneAngelover 3 years ago

    wonderful work

  • THANX AGAIN DEAR ANGEL…:)

    – Tammera

  • D. D.AMO
    D. D.AMOover 3 years ago

    Gorgeous visual and loving audio! Thanks!

  • THANK YOU EVER SO KINDLY..
    AND I AM SO HAPPY THAT YOU ENJOY THE MUSIC ALSO

    – Tammera

  • Anna Shaw
    Anna Shawover 3 years ago

    You can go straight to the Permanent Feature Gallery by clicking o the banner.
    Huge congratulations

    Anna

  • THANK YOU VERY KINDLY DEAR ANNA… :-)
    IT’S ALWAYS LOOK FORWARD TO YOUR SHINING FACE ON MY PAGE!!

    – Tammera

  • Mary Sedici
    Mary Sediciover 3 years ago


    (To see our work, click on the banner and scroll down the HomePage)
    February 14th, 2011
    Mary

  • HOW EXCITING!!!….THIS IS SUCH A WONDERFUL HONOR…THANK YOU EVER SO KINDLY DEAR MARY… :-)

    – Tammera

  • pat gamwell
  • HOW VERY EXCITING…
    I WILL GO CHECK IT OUT RIGHT AWAY….
    THANK YOU DEAR PAT… :-)

    – Tammera

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