a国产亚洲欧美精品一区在线观看_看一级黄色毛片_在线观看播放_一级片精品_国产精成人品日日拍夜夜免费_草久在线视频

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 專業詞匯 » 正文

口腔生理學術語H

放大字體  縮小字體 發布日期:2008-05-31
核心提示:Habitat - a location which has a suitable environment for an organism to live in. Caves are natural habitats for bats, trees for birds; oral surfaces and crevices, for some bacteria. Haemostasis - the prevention of blood loss through a damaged vesse


    Habitat - a location which has a suitable environment for an organism to live in. Caves are natural habitats for bats, trees for birds; oral surfaces and crevices, for some bacteria.

    Haemostasis - the prevention of blood loss through a damaged vessel wall. There are three main mechanisms, vasoconstriction, formation of a platelet plug and blood clotting.

    Heparin sulphate - a glycosaminoglycan which is unusual in that it is stored inside the cell (mast cells) surrounding the liver. Heparin prevents blood clotting.

    Herbivorous- an animal whose diet consists of grass, leaves, roots or other plant matter.

    Heterodont- a dentition in which some of the teeth have different shapes and special functions. Form "hetero" = different) see also homodont.

    Hierarchy - an order of power between individuals. A ranking of most dominant to least dominant.

    Hippocampus - part of the limbic system, it seems to provide a spatial map, useful in the event of a sudden need to escape from an unpleasant sensory experience.

    Hypothalamus - this small body of nerve cells controls the activity of the pituitary gland, the source of several hormones which control the activity of other hormones, including ACTH which in turn controls the level of glucocorticoid secretion. The hypothalamus also has powerful connections with the other members of the limbic system, from which nerve pathways descend to control nerves in the spinal cord. The influence of the limbic system on the hypothalamus explains the raised levels of glucocorticoids in response to emotional stress. This bridge with the peripheral nervous system, provides a link between the emotional state of a person, as influenced by the activity of the limbic system, and the excitability of neurones in the spinal cord, to in-coming pain impulses.

    Histamine - is a product of the amino acid, histidene and is released by damaged cells. Histamine causes an increase in capillary permeability and vasodilation, two vascular events which are the first stages of inflammation. Histamine is also a neurotransmitters substance, released at nerve synapses mostly in the hypothalamus.

    Homeostasis - control of an organism抯 internal environment. Water content, temperature, acid-base balance, level of oxygen and carbon dioxide, adequate supply of energy are some of the many factors in the organism which require monitoring and control. A common form of control is feedback.

    Homodont - a dentition in which all the teeth are the same shape (from "home" = same) see also heterodont.

    Hyaluronic acid - the largest glycosaminoglycan known, it plays an important role of restricting the flow of water in tissues, particularly in synovial fluid where it acts as a lubricant..

    Hydrogen bonds - a weak force holding two molecules containing hydrogen together, each of which has a covalent bond with another atom. For example, water is a molecule made up of two hydrogen atoms attached covalently to an oxygen atom. The hydrogen proton is however not completely balanced and is still attracted to the oxygen atom of a neighbouring molecule. Molecules of water are thus held together by hydrogen bonds, which accounts for the unusually high boiling point of water considering its low molecular weight. Hydrogen bonds hold protein molecules in shape by linking up various sections. When proteins are heated, these bonds collapse and the protein is physically altered, even though its chemical composition remains unchanged. When an egg is heated the white part rapidly gels, indicating a change in the shape of the protein. The process is not reversible.. so an egg cannot be uncooked.

    Hydroxyapatite - one of the apatites which is the main salt of bone and teeth.

    Hydroxyl ion- a negatively charged ion of hydrogen and oxygen written as OH-.

    Hyperplasia - an increase in the size of an organ due to an increase in the numbers of cells. The developing embryo increases in size due to cell division. The cells of some tissues retain the ability to divide throughout life, like the epithelium and connective tissues but muscle and nerve cells lose their ability to divide soon after birth. When hyperplasia is uncontrolled it produces a tumour which may be benign if it is well contained, not destructive and does not spread. But it may be malignant, destroys normal tissue, and spread all over the body.

    Hypertrophy - an increase in the size of an organ due to an increase in the size of each cell. Muscles increase in size due to hypertrophy.

    Hypoplasia - reduced formation of a tissue during development. Enamel hypoplasia may be recognised as pits and depressions in the enamel and may be cause by fluorosis.

    Hypotonic - a comparison between two solutions, indicating that one has a lower osmotic pressure, or is less salty than the other.

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關鍵詞: 口腔 生理學
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 0.084 second(s), 15 queries, Memory 0.9 M
主站蜘蛛池模板: 国产女人第一次做爰视频 | 亚洲精品日韩中文字幕久久久 | 91av免费在线 | 亚洲AV无码一区二区三区性色 | 免费观着女人高潮视频 | 毛片网站免费观看 | 豪放女大兵在线 | 精品国产九九 | 国产成人18黄网站免费观看 | www.日本免费 | 亚洲福利视频一区二区 | 视频一区二区三区在线 | 欧美国产日韩久久 | 97碰成人国产免费公开视频 | 国产一级爱 | 91麻豆精品在线观看 | 久久妇女高潮几次MBA | 国产日产久久高清欧美一区 | 黑人特级欧美aaaaaa片 | 黄页在线观看免费 | 亚洲精品视频一二三 | 久久精品欧美一区 | www.久久久com | 97视频精品全国免费观看 | 国产区免费在线观看 | 熟妇人妻无乱码中文字幕 | 精品无码人妻一区二区三区免费 | 性色AV片蜜臂 | 日韩一区二区三区免费观看 | 亚洲tv久久爽久久爽 | 棈品国产乱码久久久久久影片 | 伊人久久免费视频 | 少妇扒开毛茸茸的b自慰 | 欧美一线高本道高清免费 | 久操免费在线视频 | 国产精品久久久久一区二区 | 欧美黑寡妇AAAAA片 | 色女人综合网 | 日日夜夜成人 | www.youjizz在线 | 在线观看免费播放av片 |