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:
... of the Na+/K+ ATPase pump in the membranes of heart cells (myocytes) and decreases its function ... phase 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 ...
... Echocardiogram, often referred to cardiac echo or simply an echo is a sonogram of the heart ... uses standard two-dimensional, three-dimensional, and Doppler ultrasound to create images of the heart ... of patients with any suspected or known heart diseases ...
... “Talk of strange relics led to mention of the heart of a French King preserved at Nuneham in a silver casket ... 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.” The heart in question is ...
... A heart valve normally allows blood flow in only one direction through the heart ... The four valves 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 ...
More definitions of "heart":
- (noun): A playing card in the major suit of hearts.
Example: "He led the queen of hearts"
- (noun): A positive feeling of liking.
Example: "The child won everyone's heart"
Synonyms: affection, affectionateness, fondness, tenderness, warmheartedness
- (noun): The choicest or most essential or most vital part of some idea or experience.
Example: "The heart and soul of the Republican Party"
Synonyms: kernel, substance, core, center, essence, gist, heart and soul, inwardness, marrow, meat, nub, pith, sum, nitty-gritty
- (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): An inclination or tendency of a certain kind.
Example: "He had a change of heart"
- (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): 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
Famous quotes containing the word heart:
“The soldiers is the trade:
In any wind or weather
He steals the heart of maid
And man together.
The lover and his lass
Beneath the hawthorn lying,”
—A.E. (Alfred Edward)
“A celibate, like the fly in the heart of an apple, dwells in a perpetual sweetness, but sits alone, and is confined and dies in singularity.”
—Jeremy Taylor (16131667)
“The longer we live the more we must endure the elementary existence of men and women; and every brave heart must treat society as a child, and never allow it to dictate.”
—Ralph Waldo Emerson (18031882)