Notes, Exercises, Videos, Tests and Things to Remember on Golgi bodies
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Golgi body is a complex cytoplasmic structure which helps in secretion, membrane transformation, and biosynthesis. It is absent in prokaryotic cell and present in all eukaryotic cell except RBC, spermatozoa of bryophytes, pteridophytes. In the vertebrate animal cell, their is present of a large single Golgi body called gold some but in invertebrate and plant cell their presents many small Golgi bodies called dictyosomes. Similarly, it is of large size in secretory cells.eg; pancreatic cell, liver cells, and smaller size in nonsecretory cells eg; muscle cells. The shape and size of Golgi bodies are variable and depends on upon the metabolic condition of the cell.
It consists of four different structural components they are
Cisternae are elongated, flat, slightly curved plate-like structure with a swollen end. They are placed one above another in a parallel bundle and are separated by a small space called intracisternal space.
Vesicles are small sac-like structures which are formed at the periphery. They remain attached to the tip of tubules and contains secretions.
Vacuoles are the spherical or rounded structure which mainly occur at the concave surface or at the maturing face. Some of these vacuoles function as a primary lysosome.
Tubules form a network at the periphery and help to interconnect the cisternae and vesicles.
The Golgi body shows a distinct polarity with respect to its two surfaces(convex and concave surface). The convex surface or forming face is directed towards nucleus whereas its concave surface or maturing face towards cell membrane.