heart

heart
n.
a hollow muscular cone-shaped organ, lying between the lungs, with the pointed end (apex) directed downwards, forwards, and to the left. The heart is about the size of a closed fist. Its wall consists largely of cardiac muscle (myocardium), lined and surrounded by membranes (see endocardium, pericardium). It is divided by a septum into separate right and left halves, each of which is divided into an upper atrium and a lower ventricle . Deoxygenated blood from the venae cavae passes through the right atrium to the right ventricle. This contracts and pumps blood to the lungs via the pulmonary artery. The newly oxygenated blood returns to the left atrium via the pulmonary veins and passes through to the left ventricle. This forcefully contracts, pumping blood out to the body via the aorta. The direction of blood flow within the heart is controlled by valves.

The new mediacal dictionary. 2014.

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Look at other dictionaries:

  • heart — W1S1 [ha:t US ha:rt] n ↑artery, ↑brain, ↑fatty, ↑tissue, ↑heart, ↑kidney, ↑intestine, ↑intestine2, ↑small, ↑large, ↑liver, ↑lung, ↑muscles, ↑stoma …   Dictionary of contemporary English

  • Heart — (h[aum]rt), n. [OE. harte, herte, heorte, AS. heorte; akin to OS. herta, OFies. hirte, D. hart, OHG. herza, G. herz, Icel. hjarta, Sw. hjerta, Goth. ha[ i]rt[=o], Lith. szirdis, Russ. serdtse, Ir. cridhe, L. cor, Gr. kardi a, kh^r. [root]277. Cf …   The Collaborative International Dictionary of English

  • heart — [ hart ] noun *** ▸ 1 organ that pumps blood ▸ 2 area of chest with heart ▸ 3 your feelings ▸ 4 inner central part ▸ 5 shape representing love ▸ 6 suit of playing cards ▸ 7 most important part ▸ + PHRASES 1. ) count the organ in your chest that… …   Usage of the words and phrases in modern English

  • heart — [härt] n. [ME herte < OE heorte, akin to Ger herz < IE base * k̑erd , k̑ṙd , heart > L cor, (gen. cordis), Gr kardia, OIr cride, Serb sr̈ce] 1. a) the hollow, muscular organ in a vertebrate animal that receives blood from the veins and… …   English World dictionary

  • HEART — (Heb. לֵב, lev, pl. לִבּוֹת, libbot; לֵבָב, levav, pl. לְבָבוֹת, levavot). The corresponding Hebrew words only sometimes have the meanings in question but many translators and writers on Bible are, or act as if they were, largely unaware of the… …   Encyclopedia of Judaism

  • heart — ► NOUN 1) a hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation. 2) the central, innermost, or vital part: the heart of the city. 3) a person s feeling of or capacity for love or… …   English terms dictionary

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  • Heart — o su plural Hearts (en castellano: corazón o corazones) puede referirse a: Contenido 1 Traducción 2 Heart 2.1 Música 2.2 Cine y televisión …   Wikipedia Español

  • heart — O.E. heorte heart; breast, soul, spirit, will, desire; courage; mind, intellect, from P.Gmc. *khertan (Cf. O.S. herta, O.Fris. herte, O.N. hjarta, Du. hart, O.H.G. herza, Ger. Herz, Goth. hairto), from PIE *kerd heart (Cf. Gk. kardia, L …   Etymology dictionary

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