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A peg cell is a non-ciliated epithelial secretory cell within the uterine tube (oviduct or fallopian tube). [1] These cells represent one of three epithelial cell types found within the normal fallopian tube epithelium and only make up around 10% of the total number of cells. The other two cell types are ciliated columnar and intercalary cells. [1]
While the shark is moving, water passes through the mouth and over the gills in a process known as "ram ventilation". While at rest, most sharks pump water over their gills to ensure a constant supply of oxygenated water. A small number of species have lost the ability to pump water through their gills and must swim without rest.
The mechanoreceptors are hair cells, the same mechanoreceptors for vestibular sense and hearing. Hair cells in fish are used to detect water movements around their bodies. These hair cells are embedded in a jelly-like protrusion called cupula. The hair cells therefore can not be seen and do not appear on the surface of skin.
This involves using a tool to remove debris, bacteria and dead cells from your tongue — and it's something Dr. Fatima Khan, a dentist and the co-founder of Riven Oral Care, swears by.
The concentration of oxygen in water is lower than air and it diffuses more slowly. In a litre of freshwater the oxygen content is 8 cm 3 per litre compared to 210 in the same volume of air. [7] Water is 777 times more dense than air and is 100 times more viscous. [7] Oxygen has a diffusion rate in air 10,000 times greater than in water. [7]
Jellyfish reproduce sexually. Males release sperm through their mouth into the water column and this is received into the female's mouth, where fertilization occurs. Development occurs quickly, as the lifespan of a jellyfish is only a few months. The eggs develop either inside the female, or in brood pouches located on the oral arms.
Peg laterals typically occur on both sides, [2] and have short roots. [2] Inheritance may be involved, [ 2 ] and the frequency of microdontia in the upper laterals is just under 1%. [ 1 ] The second most commonly involved tooth is the maxillary third molars, [ 3 ] and after this supernumerary teeth .
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