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Diaphragm (muscle)

The diaphragm's moviment

The diaphragm is an involuntary muscle that it look like a dome. It's locate between the chest's cavity and the abdomen's cavity . It's composed by a big tendon, called phrenic centre. From this tendon starts different muscular sheaf that they're connected to the breastbone, lumbar vertebras and ribs.

Functions

The diaphragm is one of the foundamental organs for the breathing: when it tenses it lifts the diaphragmatic dome it permit the tensing and the expansion of the lung.

The diaphragm is, besides, one among the principal muscles for the respiraton: contracting makes him lower the dome diaphragmatic that together with the raising of the chest, guaranteed of the intercostal muscles, it allows the expansion and the contraction of the bellows necessary movements to the respiraton.

The phrenic centre

The phrenic centre, also called tendon centre, have the form of a clover; so it can separate in 3 sections: the rigth leaf, the centre and the left leaf.The poesterior of this tendon is collegate at the vertebras, istead the forward is collegate at the breasthbon. The phrenic centre be also crossed, where the centre leaf comine with the right of the vena cava.

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Magma

Underwater lava flow, of Hawaii

Magma is a mixture composed by molten rocks, a small part of water and some gas dissolve in it, located between Earth's nucleus and earth crust. Magma's density change according to its chemical composition. When it come out the earth crust, magma's called lava, because it lose gases.

Origin

Magma was create when the Earth was born for a short ti Diaphragm User:Giuliano.colo/sandbox 2017 2003B User:Asia.dipace/sandbox 2017 2003B User:Ladji.doumbia/sandbox 2017 2003B User:Frasca.leone03/Sandbox 2017 2003B Gene Diaphragm User:Nadine graziotti/Sandbox 2017 2003B User:asia.moltini/Sandbox 2017 2003B User:Gabriele.pellegrini/Sandbox 2017 2003B sun User:christopher.ravizza/Sandbox 2017 2003B User:Leonardo.rosa/Sandbox 2017 2003B User:Luca.santolini/Sandbox 2017 2003B seismograph User:Virginia.sartori/Sandbox 2017 2003B Antarctic User:Margherita.stasii/Sandbox 2017 2003B Tsunami Finito User:Alessio Tagliapietra/Sandbox 2017 2003B Chromosome User:Dennis.tiboni/Sandbox 2017 2003B seismograph User:Marica.tiboni/Sandbox 2017 2003B User:Eng.stefano.toniatti/Sandbox 2017 2003B User:Aurora.zendri/sanbox 2017 2003B Category: Vikidian teachers Navigation menu Coali.giulio 0 1 TalkPreferencesWatchlistContributionsLog outUser pageDiscussionReadEditEdit sourceView historyUnwatch More Search  Search Vikidia Go Main page Recent changes Random article Request for administrators Vikidia What is Vikidia? Discussion Basic principles Contact IRC Donate to Vikidia Tools What links here Related changes User contributions Logs Upload fileme, after the melting of particular kinds of rocks, , caused by a changement of presure and temperatur, with steam's flu, that change the melting point of minerals.

Kind There are two kinds of magma:

• Primal magma, create after partial melting of earth's coat.This process happens on determinate conditions of pressure, temperature and water content dissolved it. Usually the increase of temperature and of the steam's pressure favour the melting, while the increase of the pressure tends to reduce it. The kind of rocks that create magma starts to melts, this kind of rocks is characterised by an impoverished silica composition. This magma is characterised by silica content around 50% in weight (it is a low value for a rock), poor of water and gas, is fluid and therefore fast in crossing the terrestrial crust and from him the basic lava derives. The speed of ascent of this magma it hampers their cooling then the temperature to the moment of the eruption can go about also around 1 200°C.

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• Secondary magma or acids: they form in particular conditions of subduction of the terrestrial crust: crust parts are driven to depth and then in conditions of pressure and temperature similar to those that favour the fusion of earth's coat, the rock that is melted nevertheless is of acid composition made rich that is in silica. Acids magma form also for magmatic differentiation in consequence of divided crystallisation: for the slow reclimbing and the progressive cooling of a basic magmas what loses little by little the minerals more famic, like the olivine. It's magma rich in silicon and often of water. As a result, they turn out to be particularly viscous and tend to solidify inside the terrestrial crust forming a pluto. They reach rarely the terrestrial surface and when this happens, it happens in violent and explosive way.

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