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Alemannisch; Anarâškielâ; العربية; Aragonés; অসমীয়া; Asturianu; Azərbaycanca; বাংলা; 閩南語 / Bân-lâm-gú; Башҡортса
A limb (from Old English lim, meaning "body part") is a jointed, muscled appendage of a tetrapod vertebrate animal used for weight-bearing, terrestrial locomotion and physical interaction with other objects. The distalmost portion of a limb is known as its extremity.
It was written around 350 BC. The whole work is roughly a study in animal anatomy and physiology; it aims to provide a scientific understanding of the parts (organs, tissues, fluids, etc.) of animals and asks whether these parts were designed or arose by chance.
At the same time, a second meaning arose, in reference to a "body part adapted to a certain function". [15] Plant organs are made from tissue composed of different types of tissue. The three tissue types are ground, vascular, and dermal. [16] When three or more organs are present, it is called an organ system. [17]
The body tissues are composed of numerous types of cells, including those found in muscles, nerves and skin. Each typically has a cell membrane formed of phospholipids, cytoplasm and a nucleus. All of the different cells of an animal are derived from the embryonic germ layers.
The three-part appearance of many insect bodies and the two-part appearance of spiders is a result of this grouping. [42] There are no external signs of segmentation in mites . [ 38 ] Arthropods also have two body elements that are not part of this serially repeated pattern of segments, an ocular somite at the front, where the mouth and eyes ...
A skeleton is the structural frame that supports the body of most animals.There are several types of skeletons, including the exoskeleton, which is a rigid outer shell that holds up an organism's shape; the endoskeleton, a rigid internal frame to which the organs and soft tissues attach; and the hydroskeleton, a flexible internal structure supported by the hydrostatic pressure of body fluids.
Modern groups of animals can be grouped by the arrangement of their body structures, so are said to possess different body plans. A body plan , Bauplan ( pl. German : Baupläne ), or ground plan is a set of morphological features common to many members of a phylum of animals . [ 1 ]
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