THE HEART

BLOOD:/blʌd/ n [U] The red liquid that is sent around the body by the heart, and carries oxygen and important substances to organs and tissue, and removes waste products. He lost a blood in the accident

PROVIDES: prəˈvaɪd/ v [T] to give someone something that they need. Blood provides the body with the oxygen and nutrients.

NEED: niːd/ v [T] to have to have something, or to want something very much. The doctor said I needed an operation.

BEAT: /biːt/ n [C or U] a regular movement or sound, especially that made by your heart. I put my head on his chest but I could feel no heart beat.

ATRIA:/ˈeɪ.tri.əm/ n [C] (plural atriums) (also auricle )specialized one of the two spaces at the top part of the heart which receive blood from the veins and push it down into the ventricles (= lower spaces)
BOTTOM: /ˈbɒt.əm/ /ˈbɑː.t ̬əm/ n [C usually singular] the lowest part of something He stood at the bottom of the stairs and called up to me.

THICK: /θɪk/ adj. Having a large distance between two sides. A thick layer of dust.

VEIN:/veɪn/ n [C] a tube that carries blood to the heart from the other parts of the body. The cava vein.

PUMP:pʌmp/ v [T usually + adverb or preposition] to force liquid or gas to move somewhere. Our latest machine can pump a hundred gallons a minute

LUNGS: /lʌŋ/ n [C] Either of the two organs in the chest with which people and some animals breathe