Functions of the kidneys. 1  Filter and remove excess fluid, waste and toxic substances from the blood as urine. 2  Regulate the chemical composition of blood such as salt, potassium and acid. 3  Secrete three important hormones: 4  Erythropoietin: hormone which is needed to stimulate the production of red blood cells.
These cells include skin cells, blood cells, and any cell other than sex cells. Meiosis is the process that creates sex cells. These cells include sperm and egg cells. Seminiferous tubules are structures located in the male reproductive gland known as the testis. Meiosis in males occurs in the seminiferous tubules. This means that the seminiferous tubules are crucial in the process of reproduction. The seminiferous tubules consist of a network of tubes that are lined with a type of cell known as a sertoli cells. Sertoli cells are long columnar cells that are differentiated during the process of meiosis to form sperm.
A serous demilune or Crescents of Gianuzzi is a cap in the shape of a half-moon (hence the name demilune) on some salivary glands.Serous demilunes are the serous cells at the distal end of mucous tubuloalveolar secretory unit of certain salivary glands.These demilune cells secrete the proteins that contain the enzyme lysozyme, which degrades the cell walls of bacteria. In this way, lysozyme confers antimicrobial activity to mucus.he serous demilune is an artifact from traditional methods of preparing samples. Samples are traditionally preserved and fixed in formaldehyde. When samples were preserved by quick-freezing in liquid nitrogen and then fixed with osmium tetraoxide in acetone, no demilunes are found.