What is heart?

  • (noun): A playing card in the major suit of hearts.
    Example: "He led the queen of hearts"
    See also — Additional definitions below

Heart

The heart is a hollow muscle that pumps blood throughout the blood vessels by repeated, rhythmic contractions. It is found in all animals with a circulatory system (including all vertebrates).

Read more about Heart.

Some articles on heart:

Digoxin - Mechanism of Action
... α-subunit of the Na+/K+ ATPase pump in the membranes of heart cells (myocytes) and decreases its function. 0 of the cardiac action potential, which leads to a decrease in heart rate ... (the force of contraction) of the heart without increasing heart energy expenditure ...
Digoxin - Pharmacokinetic Properties
... urgent situations (the IV injection should be slow, and heart rhythm should be monitored) ... For congestive heart failure, levels between 0.5 and 1.0 ng/ml are recommended ... For heart rate control (atrial fibrillation), plasma levels are less defined and are generally titrated to a goal heart rate ...
Echocardiography
... or simply an echo is a sonogram of the heart ... and Doppler ultrasound to create images of the heart ... the diagnosis, management, and follow-up of patients with any suspected or known heart diseases ...
Heart Valve
... A heart valve normally allows blood flow in only one direction through the heart ... commonly represented in a mammalian heart determine the pathway of blood flow through the heart ... A heart valve opens or closes incumbent upon differential blood pressure on each side ...
William Buckland - Megalosaurus and Marriage
... of strange relics led to mention of the heart of a French King preserved at Nuneham in a silver casket ... at it, exclaimed, ‘I have eaten many strange things, but have never eaten the heart of a king before,’ and, before anyone could hinder him, he had gobbled it up, and the precious relic was lost for ever ...

More definitions of "heart":

  • (noun): The locus of feelings and intuitions.
    Example: "In your heart you know it is true"
    Synonyms: bosom
  • (noun): A firm rather dry variety meat (usually beef or veal).
    Example: "A five-pound beef heart will serve six"
  • (noun): The courage to carry on.
    Example: "You haven't got the heart for baseball"
    Synonyms: mettle, nerve, spunk
  • (noun): A plane figure with rounded sides curving inward at the top and intersecting at the bottom; conventionally used on playing cards and valentines.
    Example: "He drew a heart and called it a valentine"
  • (noun): The hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions pump blood through the body.
    Example: "He stood still, his heart thumping wildly"
    Synonyms: pump, ticker
  • (noun): An inclination or tendency of a certain kind.
    Example: "He had a change of heart"
    Synonyms: spirit
  • (noun): An area that is approximately central within some larger region.
    Example: "They ran forward into the heart of the struggle"
    Synonyms: center, centre, middle, eye

Famous quotes containing the word heart:

    But the heart refuses to be imprisoned; in its first and narrowest pulses it already tends outward with a vast force and to immense and innumerable expansions.
    Ralph Waldo Emerson (1803–1882)

    ...I delivered the poor who cried, and the orphan who had no helper. The blessing of the wretched came upon me, and I caused the widow’s heart to sing for joy. I put on righteousness, and it clothed me; my justice was like a robe and a turban. I was eyes to the blind, and feet to the lame. I was a father to the needy, and I championed the cause of the stranger. I broke the fangs of the unrighteous, and made them drop their prey from their teeth.
    Bible: Hebrew, Job 29:12-17.

    Job, recounting his faithfulness.

    If the heart of a man is deprest with cares,
    The mist is dispell’d when a woman appears;
    Like the notes of a fiddle, she sweetly, sweetly
    Raises the spirits, and charms our ears.
    John Gay (1685–1732)