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Organ (anatomy)
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In biology and anatomy, an organ (Latin: organum, "instrument, tool", from Greek ὄργανον - organon, "organ, instrument, tool") is a accumulating of tissues abutting in structural assemblage to serve a accepted action 1.
Usually there is a main tissue and sporadic tissues. The capital tissue is the one that is different for the specific organ. For example, capital tissue in the heart is the myocardium, while desultory are the nerves, blood, connective etc.. Functionally accompanying organs generally abet to analysis accomplished organ systems. Organs abide in all college biological organisms, in accurate they are not belted to animals, but can aswell be articular in plants. In single-cell bacilli like bacteria, the functional analogues of organs are alleged organelles.
A hollow organ is a belly agency that is a alveolate tube or accessory (as the stomach or intestine) or that includes a atrium (as of the heart or urinary bladder).2
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The functions of agency systems generally allotment cogent overlap. For instance, the nervous and endocrine system both accomplish via a aggregate organ, the hypothalamus. For this reason, the two systems are accumulated and advised as the neuroendocrine system. The aforementioned is accurate for the musculoskeletal system, which involves the accord amid the muscular and skeletal systems.
Organs of plants can be disconnected into abundant and reproductive. Abundant bulb organs are root, stem and leaf. The changeable organs are variable. In angiosperms, they are represented with the flower, seed and fruit. In conifers, the agency that bears the changeable structures is alleged a cone. In added capacity of plants, the changeable organs are alleged strobili (in Lycopodiophyta) or artlessly gametophores (in mosses).
The abundant organs are capital for advancement the activity of a bulb (they accomplish the basic functions, such as photosynthesis), while the changeable organs are capital in reproduction. However, if there is asexual vegetative reproduction, the abundant organs are those that actualize the new bearing of plants (see clonal colony).
The two capital agency systems in vascular plants are the basis arrangement and the shoot system.
The agency akin of organisation in animals can be aboriginal detected in flatworms and the added avant-garde phyla. The less-advanced taxons (like Placozoa, Porifera and Radiata) do not appearance alliance of their tissues into organs.
There are about advised to be eleven above agency systems of the animal body. Humans accept a array of systems due to the complication of the species' organism. These specific systems are broadly advised in Human anatomy. "Human" systems are aswell present in abounding animals.
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