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The human skin is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue guarding muscles, bones, ligaments and internal organs. Human skin is similar to most of the other mammals' skin, and it is very similar to pig skin.
The dermis is composed of three major types of cells: [3] fibroblasts, macrophages, and mast cells.. Apart from these cells, the dermis is also composed of matrix components such as collagen (which provides strength), elastin (which provides elasticity), and extrafibrillar matrix, an extracellular gel-like substance primarily composed of glycosaminoglycans (most notably hyaluronan ...
The subcutaneous tissue (from Latin subcutaneous 'beneath the skin'), also called the hypodermis, hypoderm (from Greek 'beneath the skin'), subcutis, or superficial fascia, [2] is the lowermost layer of the integumentary system in vertebrates. [3] The types of cells found in the layer are fibroblasts, adipose cells, and macrophages.
The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. [1] The epidermis layer provides a barrier to infection from environmental pathogens [2] and regulates the amount of water released from the body into the atmosphere through transepidermal water loss.
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]
This is an accepted version of this page This is the latest accepted revision, reviewed on 8 December 2024. Type of society and economic system This article is about the hypothetical stage of socioeconomic development. For the economic systems of the former Soviet and Eastern Bloc Communist states, see Soviet-type economic planning. For communistic society, see Intentional community. Part of a ...
Part of a series on Communism Concepts Anti-capitalism Class conflict Class consciousness Classless society Collective leadership Communist party Communist revolution Communist state Commune Communist society Critique of political economy Free association "From each according to his ability, to each according to his needs" Market abolitionism Proletarian internationalism Labour movement Social ...
Communism has usually been distinguished from socialism since the 1840s. The modern definition and usage of socialism settled by the 1860s, becoming the predominant term among the group of words associationist, co-operative and mutualist which had previously been used as synonyms. Instead, communism fell out of use during this period. [54]