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Whereas the beta form had been identified in 1845, [3] α-PbO 2 was first identified in 1946 and found as a naturally occurring mineral 1988. [4] The alpha form has orthorhombic symmetry, space group Pbcn (No. 60), Pearson symbol oP12, lattice constants a = 0.497 nm, b = 0.596 nm, c = 0.544 nm, Z = 4 (four formula units per unit cell). [4]
The SA node cells are smaller and paler than the surrounding atrial cells, with the average cell being around 8 micrometers in diameter and 20-30 micrometers in length (1 micrometer= 0.000001 meter). [7] Unlike the atrial cells, SA node cells contain fewer mitochondria and myofibers, as well as a smaller sarcoplasmic reticulum.
Extraglomerular mesangial cells are located in the junction between the afferent and efferent arterioles. These cells have a contractile property similar to vascular smooth muscles and thus play a role in “regulating GFR” by altering the vessel diameter. Renin is also found in these cells. [4]
Schematic of cell adhesion. Cell adhesion is the process by which cells interact and attach to neighbouring cells through specialised molecules of the cell surface. This process can occur either through direct contact between cell surfaces such as cell junctions or indirect interaction, where cells attach to surrounding extracellular matrix, a gel-like structure containing molecules released ...
The microtubule-organizing center (MTOC) is a structure found in eukaryotic cells from which microtubules emerge. MTOCs have two main functions: the organization of eukaryotic flagella and cilia and the organization of the mitotic and meiotic spindle apparatus, which separate the chromosomes during cell division.
[1] [7] [10] Three different cell types exist: far cells, near cells, and tuned zero cells. Far cells respond to disparities in planes further away from the plane of fixation, near cells are stimulated by disparities in planes closer than the plane of fixation, and tuned zero cells respond to disparities on the plane of fixation.
The carotid body is not labelled but is located within the wall of the internal carotid artery near the bifurcation of the common carotid artery. Glomus type I cells are the chemoreceptor cells found in the carotid body. Glomus cells are the cell type mainly located in the carotid bodies and aortic bodies. Glomus type I cells are peripheral ...
Lead(II) oxide, also called lead monoxide, is the inorganic compound with the molecular formula Pb O.It occurs in two polymorphs: litharge having a tetragonal crystal structure, and massicot having an orthorhombic crystal structure.