1、什麼是上皮細胞？有什麼特點？
上皮細胞是位於皮膚或腔道表層的細胞.
上皮細胞的形狀有扁平,柱狀等等.
皮膚外層的上皮細胞普遍角質化,有保護和吸收的作用.
腔道中的上皮細胞多分化,有分泌,排瀉和吸收等功能.
2、上皮細胞是什麼意思？
組織:
在胚層分過程中,
來源相同、形態和功能相近似的細胞和細胞間質,
有機的組合在一起稱為組織。
組織又分為：上皮組織、結締組織、肌組織、神經組織。上皮組織的種類：
1、被覆上皮
2、腺上皮
3、感覺上皮
4、肌上皮
5、生殖上皮
上皮組織中的細胞叫上皮細胞
3、什麼是上皮細胞?有什麼特點?
上皮細胞是位於皮膚或腔道表層的細胞.
上皮細胞的形狀有扁平,柱狀等等.
皮膚外層的上皮細胞普遍角質化,有保護和吸收的作用.
腔道中的上皮細胞多分化,有分泌,排瀉和吸收等功能.
4、上皮細胞的種類有什麼？分別是什麼作用
上皮細胞的種類有：扁平上皮，立方上皮，柱狀上皮和腺上皮。
1.扁平上皮，立方上皮，柱狀上皮這三種上皮細胞的功能類似，主要起保護作用，即可以防止外來物的損傷和病菌侵入。
2.腺上皮細胞主要有分泌作用。
3.扁平上皮，立方上皮，柱狀上皮這三種細胞主要分布在皮膚表面和各管腔壁內表面。而腺上皮細胞主要分布在皮膚，口腔，胃和腸等處。
4.扁平上皮，立方上皮，柱狀上皮這三種細胞的結構特徵為：細胞排列緊密，細胞間質少；而腺上皮細胞的結構特徵為：由腺細胞構成。
5、上皮細胞的種類有什麼?分別是什麼作用?
上皮組織結構上可以分為兩組取決於層數的，它是組成。 Epithelial tissue that is only one cell thick is known as simple epithelium.上皮組織，這只是一個細胞的厚度為單層上皮而聞名。 If it is two or more cells thick, it is known as stratified epithelium.如果是兩個或多個單元格厚，它被稱為復層上皮。
However, when taller simple epithelial cells (see columnar , below) are viewed in cross section with several nuclei appearing at different heights, they can be confused with stratified epithelia.然而，當高大簡單上皮細胞（見柱狀 ，下文）第看待兩岸在幾個不同高度的原子核出現，它們可以混淆分層上皮。 This kind of epithelium is therefore described as "pseudostratified" epithelium.這種上皮種，因此稱為「假」上皮。
Regardless of the type, any epithelium is separated from the underlying tissue by a thin layer of connective tissue known as the basement membrane.無論類型，任何上皮組織分離的基礎，作為一個著名的基底膜結締組織的薄層。 The basement membrane provides structural support for the epithelium and also binds it to neighbouring structures.基底膜上皮結構提供了支持，並把它綁定到鄰近的結構。
鱗狀細胞具有薄，平板外觀。 They fit closely together in tissues; providing a smooth, low-friction surface over which fluids can move easily.他們適合在組織密切合作，提供一個平穩，低摩擦表面的液體能夠在移動方便。 The shape of the nucleus usually corresponds to the cell form and helps to identify the type of epithelium.原子核的形狀通常對應的細胞形態，以幫助確定的上皮細胞類型。 Squamous cells tend to have horizontally flattened, elliptical (oval or shaped like an egg) nuclei because of the thin flattened form of the cell.鱗狀細胞往往有橫向扁平，橢圓形（橢圓形或像一個雞蛋形的）核，因為薄扁平的細胞形態。 Classically, squamous epithelia are found lining surfaces utilizing simple passive diffusion such as the alveolar epithelium in the lungs.經典，鱗狀上皮細胞表面發現襯里利用，如簡單的被動擴散肺泡上皮細胞在肺部。 Specialized squamous epithelia also form the lining of cavities such as the blood vessels ( endothelium ) and pericardium ( mesothelium ) and the major cavities found within the body.還專門鱗狀上皮的形成（血管襯腔，如內皮細胞 ）和心包 （ 間皮 ），並在體內發現的主要腔。 :) ：）
Cuboidal 立方形 As their name implies, cuboidal cells are roughly cuboidal in shape, appearing square in cross section.正如其名稱所示，大致立方立方細胞的形狀，出現在橫截面。 Each cell has a spherical nucleus in the centre.每個單元都有一個球形核的中心。 Cuboidal epithelium is commonly found in secretive or absorptive tissue: for example the (secretive) exocrine gland the pancreas and the (absorptive) lining of the kidney tubules as well as in the cts of the glands.立方上皮常見於遮遮掩掩，或吸收組織：例如（秘密）外分泌腺胰腺和腎臟的（吸收）內襯管以及在腺體的導管。 They also constitute the germinal epithelium that covers the female ovary.他們也構成了生發上皮 ，涵蓋了女性卵巢。
Columnar 柱狀 Columnar epithelial cells are elongated and column-shaped.柱狀上皮細胞伸長和列形。 Their nuclei are elongated and are usually located near the base of the cells.拉長的細胞核，通常是附近的基地位於細胞。 Columnar epithelium forms the lining of the stomach and intestines.柱狀上皮構成了胃和腸的內層。 Some columnar cells are specialized for sensory reception such as in the nose, ears and the taste buds of the tongue.有些柱狀細胞是專門用於接收，如感覺鼻子，耳朵和舌頭的味蕾。 Goblet cells (unicellular glands) are found between the columnar epithelial cells of the odenum.杯狀細胞（單細胞腺）被發現十二指腸之間的柱狀上皮細胞。 They secrete mucus, which acts as a lubricant.它們分泌黏液，它作為一個潤滑劑。
Pseudostratified 假 These are simple columnar epithelial cells whose nuclei appear at different heights, giving the misleading (hence "pseudo") impression that the epithelium is stratified when the cells are viewed in cross section.這些都是簡單的柱狀，其細胞核出現在不同的高度，給誤導（因此「偽」）印象是分層的上皮細胞時，在橫截面看上皮細胞。 Pseudostratified epithelium can also possess fine hair-like extensions of their apical (luminal) membrane called cilia .假上皮細胞也可以擁有（腔）膜稱為細毛狀擴展其頂端的纖毛 。 In this case, the epithelium is described as "ciliated" pseudostratified epithelium.在這種情況下，上皮細胞被稱為「纖毛」假上皮。 Cilia are capable of energy dependent pulsatile beating in a certain direction through interaction of cytoskeletal microtubules and connecting structural proteins and enzymes.纖毛是在一定的方向依賴能源能夠通過互動搏動跳動細胞骨架微管及連接結構蛋白和酶。 The wafting effect proced causes mucus secreted locally by the goblet cells (to lubricate and to trap pathogens and particles) to flow in that direction (typically out of the body).該效應產生的原因飄出分泌黏液的杯狀細胞在本地（潤滑和病原體和捕獲粒子）流在這個方向（通常出體外）[ edit ] Stratified epithelium [ 編輯 ] 復層上皮