Comparison between tract and nerve

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  Comparison between tract and nerve Nerve Nerve contain bundle of axons (nerve fibers) in the peripheral nervous system (PNS) that transmits signals between the central nervous system (CNS) and other parts of the body. It is the most important part of peripheral nervous system Location: Peripheral nervous system. Structure: Made of axons, connective tissue layers (endoneurium: axon is surrounded by it , perineurium: bundle of axons are surrounded by it, epineurium: whole nerve trunk is surrounded by it), and blood vessels. It gets myelination by Schwann cell   Function: Carries sensory signals to the CNS (afferent) from peripheral part of body or motor signals carry from from the CNS (efferent) to target organs like skeletal muscle, cardiac muscle, smooth muscle or glands Example: Sciatic nerve, median nerve, except optic nerve (though optic nerve is technically part of CNS in develop...
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Difference between euchromatin and heterochromatin

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Heterochromatic
1.      Densely packed portion of chromatin
2.      It contain inactive DNA
3.      It is genetically inactive.
4.      It has staining capacity with hematoxylin so it looks Bluish in colour.

5.      Genes contain within the inactive DNA are not always express until specific signal is came


6.      It is responsible for gene regulation and protect integrity of chromosomes

7.      It is unable to produce mRNA so it cannot produce protein   


8.      So a cell with dark blue nucleus mean inactive cell
9.      It is located periphery of nucleus
10.  Example : lymphocyte, fibrocyte

Euchromatic
1.       uncoiled portion of chromatin
2.      It contain active DNA,RNA & protein
3.      It is genetically active
4.      It has no staining capacity with hematoxylin so it is l ightly stain


5.      Genes can express and some part of euchromatin converted into heterochromatic

6.      Its activity essential for cell survival


  
7.      It is able to produce  mRNA so it can  produce protein

8.      So a cell with light stain  nucleus mean active cell
9.      No definite location
10.  Example: neuron , hepatic cells

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