Heart

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).

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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)

    “What if I look upon a man
    As though on my beloved,
    And my blood be cold the while
    And my heart unmoved?
    Why should he think me cruel
    Or that he is betrayed?”
    —William Butler Yeats (1865–1939)

    “Within my heart is the lamp of love,
    And that is day!”
    —Percy Bysshe Shelley (1792–1822)