Centrosome Definition Biology- Structure, Origin, Location, Size, Function

Centrosome Definition Biology | Centrosome Location And Function | Centrosome Function | Centriole Definition Biology | Centrosome Structure |

Centrosome Definition Biology

Centrosome: In the cytoplasm of plant cells and in the corners of plant cells, and in the case of uncanny stars located very close to the nucleus, the cell organelle that forms seamless cells during cell division is called the centrosome.

Centrosome Structure

The centrosome consists mainly of four parts, such as the centrosphere, kinoplasm, the astral ray or aster, and the centriole.

(i) Centrosphere: A granular cytoplasmic homogeneous mass outside the centrosome.
(ii) Kinaplasm: The cytoplasmic part of the center of the centrosome.
(iii) Astral ray (astral) tubular scattering from the centrosphere.
(iv) Particles consisting of two hollow peppers formed by the nucleus located at the center of the centriole kinoplasm.

centriole definition biology

(a) Definition: Centriole is a cellular organelle composed mainly of hollow, tubular nine-NY ay molecules (Nine microtubule triplets) that play a special role in the organization of spindle fibers and help in cell division. Centrosphere is a dark cell less cytoplasm with a cell organelle and large particles around the ball and the centriole. The centriole together with the centrosphere is called the centrosome.

(b) Naming and T. Boveri named Centriole in 1888.

(c) Origin The centriole is formed from the original centriole present in the 4 centrosomes.

(d) Distribution and Location Centrioles are found in the cytoplasm near the nucleus in almost all animal cells. In mammalian blood cells. There is no centriole. Nerve cells contain inactive centrioles. Some lower-class plants like Chlamydiamenus, Volvox, etc. have centrioles in their cells.

(e) Number: A cell has a centrosome and contains two centrioles. Together the two are called diplosomes.

(f) Size: The dimensions of tubular centriole are 0.2 x 0-5 am.

(g) Ultrastructure: Centrioles look like cylindrical, hollow two-faced play pip. The two centrioles are at right angles to each other. Electron microscopy shows that the circumference of the centriole consists of nine triangular microtubules. Three molecules of a triad together form a blade

The molecules of the blade are twisted in a certain way. The molecules of each blade are named or marked with the letters A, B, and C from the center to the circumference. The centriole has no central atrium in the corner and no special arm in the corner. The molecules are connected to each other by connective or linker fibers, and with these structures, the centriole is viewed from the front in the direction of the wheels of the car. Each molecule has a few
The ‘A’ molecule at the center of the protofilament is made up of 13 protofilaments and the ‘B’ and ‘C’ molecules are made up of 10 protofilaments each.

Centrosome Function

1. Cells form bemat during division.
2. The chromosomes help the chromosomes to move towards the opposite pole during division.
3. Helps in creation of cilia and flagella.
4. The tail of the sperm is formed from the distal centriole.

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