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The skin is one of the largest organs of the body. In humans, it accounts for about 12 to 15 percent of total body weight and covers 1.5 to 2 m 2 of surface area. [1] 3D still showing human integumentary system. The skin (integument) is a composite organ, made up of at least two major layers of tissue: the epidermis and the dermis. [2]
For example, Linnaeus had included 700 species of mollusc in the 10th edition, and added a further 100 species for the 12th edition. [8] Similarly, the number of bird species in the 12th edition was twice the number in the 10th edition. [9] Sponges were included in the 12th edition, in the class "Zoophyta", having been omitted from previous ...
A system of nomenclature for the plumage of birds proposed in 1959 by Philip S. Humphrey and Kenneth C. Parkes [10] to make the terminology for describing bird plumages more uniform. [257] Examples of Humphrey–Parkes terminology versus traditional terminology may be seen in the entries for prealternate moult and prebasic moult. hyoid apparatus
Integumentary system: skin, hair, nails; Lymphatic system: structures involved in the transfer of lymph between tissues and the blood stream, the lymph and the nodes and vessels that transport it; Musculoskeletal system: muscles provide movement and a skeleton provides structural support and protection with bones, cartilage, ligaments, tendons
Also part of the fish's integumentary system are the scales that cover the outer body of many jawed fish. The commonly known scales are the ones that originate from the dermis or mesoderm, and may be similar in structure to teeth. Some species are covered by scutes instead. Others may have no scales covering the outer body.
The digestive system of earwigs is like all other insects, consisting of a fore-, mid-, and hindgut, but earwigs lack gastric caecae which are specialized for digestion in many species of insect. Long, slender (extratory) malpighian tubules can be found between the junction of the mid- and hind gut.
An echinoderm (/ ɪ ˈ k aɪ n ə ˌ d ɜːr m, ˈ ɛ k ə-/) [2] is any animal of the phylum Echinodermata (/ ɪ ˌ k aɪ n oʊ ˈ d ɜːr m ə t ə /), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". [3]
Though they are typically slow on land, crocodilians can produce brief bursts of speed; some can run at 12 to 14 km/h (7.5 to 8.7 mph) for short distances. [53] In some small species, such as the freshwater crocodile , running can progress to galloping, which involves the hind limbs launching the body forward and the fore limbs subsequently ...