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 arteriole and venule

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Difference between arteriole and venule

Arteriole

Venule

Arterioles distribute blood to capillary beds, the sites of exchange with the body tissues.

 Blood of capillaries lead back to small vessels known as venules that flow into the larger veins and eventually back to the heart.

·         The lumina of arteriole are much smaller than corresponding venule  

 

·         The lumina of venules are much larger  than corresponding arterioles.  

 

·         The walls of the arteriole are much thicker  than venule

 

·         The walls of the veins are much thinner than arterioles

Arteriole provides 50% peripheral resistance

·         Veins and venules can withstand a much lower pressure from the blood flowing through them. Their lumens are correspondingly larger in diameter to allow more blood to flow with less vessel resistance.  

 

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