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The number of cells in these groups vary with species; it has been estimated that the human body contains around 37 trillion (3.72×10 13) cells, [7] and more recent studies put this number at around 30 trillion (~36 trillion cells in the male, ~28 trillion in the female).
When publishers wish to distinguish between the front matter and the body, the initial title pages are blind folios, the front matter is numbered using lower-case Roman numerals (i, ii, iii...) and the first page of the body or main content begins with 1. The title page of the body, if present, is a blind folio; similarly, any section title ...
The median plane, which divides the body into left and right. [2] [6] This passes through the head, spinal cord, navel, and, in many animals, the tail. [6] The sagittal planes, which are parallel to the median plane. [1] The frontal plane, also called the coronal plane, which divides the body into front and back. [2]
The clock and wavefront model is a model used to describe the process of somitogenesis in vertebrates. Somitogenesis is the process by which somites , blocks of mesoderm that give rise to a variety of connective tissues, are formed.
In cell biology, an organelle is a specialized subunit, usually within a cell, that has a specific function.The name organelle comes from the idea that these structures are parts of cells, as organs are to the body, hence organelle, the suffix -elle being a diminutive.
The neocortex is the most developed in its organisation and number of layers, of the cerebral tissues. [5] The neocortex consists of the grey matter, or neuronal cell bodies and unmyelinated fibers, surrounding the deeper white matter (myelinated axons) in the cerebrum. This is a very thin layer though, about 2–4 mm thick. [6]
Before the cell enters G1 phase, i.e. before the formation of the cilium, the mother centriole serves as a component of the centrosome. In cells that are destined to have only one primary cilium, the mother centriole differentiates into the basal body upon entry into G1 or quiescence. Thus, the basal body in such a cell is derived from the ...
Its primary function is to give the cell its shape and mechanical resistance to deformation, and through association with extracellular connective tissue and other cells it stabilizes entire tissues. [ 4 ] [ 5 ] The cytoskeleton can also contract, thereby deforming the cell and the cell's environment and allowing cells to migrate . [ 6 ]