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Each cell in the respiratory epithelium has around 200 motile cilia. [12] In the reproductive tract, smooth muscle contractions help the beating of the cilia in moving the egg cell from the ovary to the uterus. [13] [15] In the ventricles of the brain ciliated ependymal cells circulate the cerebrospinal fluid.
The cells in the respiratory epithelium are of five main types: a) ciliated cells, b) goblet cells, c) brush cells, d) airway basal cells, and e) small granule cells (NDES) [6] Goblet cells become increasingly fewer further down the respiratory tree until they are absent in the terminal bronchioles; club cells take over their role to some extent here. [7]
In Paramecium tetraurelia, the clonally aging line loses vitality and expires after about 200 fissions, if the cell line is not rejuvenated by conjugation or self-fertilization. The basis for clonal aging was clarified by the transplantation experiments of Aufderheide in 1986 [ 28 ] who demonstrated that the macronucleus, rather than the ...
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Basal cells are the stem cells or progenitors of the airway epithelium and can differentiate to replenish all of the epithelial cells including the ciliated cells, and secretory goblet cells. [2] [3] This repairs the protective functions of the epithelial barrier. [3] Basal cells are cuboidal with a large nucleus, few organelles, and scattered ...
Bruce Cockburn, who wrote the theme song for beloved Canadian animated series Franklin, has spoken out after a wave of videos compared Beyoncé’s new No. 1 single to his kids’ creation.
"Listen" is a song recorded by American singer and songwriter Beyoncé. The song was written by Beyoncé, Henry Krieger, Scott Cutler and Anne Preven, and produced by The Underdogs, Matt Sullivan and Randy Spendlove for the 2006 musical film Dreamgirls, in which Beyoncé's character Deena Jones sings the song in an expression of independence from her controlling husband.
Ready those dance moves now, now, now, now. Beyoncé's new country song "Texas Hold 'Em" has fans line dancing all over social media. "I wanna learn country dance now,” one fan posted on X. The ...