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 spermatozoa and ovum

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Difference between spermatozoa and ovum 

Topics
Spermatozoa
Ovum
size
small
head 5.1μm and tail 50 μm
largest cell of human body
0.15 - .2 mm
shape
head, neck ,middle piece and tail
round
nucleus
nucleus condense with no nucleoplasm  
nucleus is bloated with nucleoplasm
centriole
present
absent
cytoplasm
very scanty
abundant
covering
surrounded by cell membrane
surrounded by cell membrane and zona pellucida
motility
highly motile
no motility

internally inactive and immotile
internally active and motile
types : according to sex chromosome
two types of cells :
22X
22 Y
one type of cell
Only 22X
mitochondria
exclude during fertilization
include during fertilization
Life span
3-5 days
12-24 hrs
Metabolically
passive
active
DNA damage
less
more
site of formation
epididymis of testes
ovary
time of formation
after puberty , they form continuously
after puberty , single ovum produce each menstrual cycle
hormone
it is influence by testosterone
it is influence by estrogen
duration of formation
it start to form at puberty and continued for life long
it start to form at puberty and continued for 45 to 50 years
immature germ cells
they are produce from spermatogonia
they are produce from oogonium
formation of immature germ cells
can multiply throughout the life
stop multiplication at intrauterine life
process
it is formed by two processes
Spermatogenesis (formation of spermatid)  and spermiogenesis
it is formed by oogenesis


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