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 T lymphocyte and B lymphocyte

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Difference between T lymphocyte and B lymphocyte 
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topic 
T lymphocyte
B lymphocyte
Origin
Bone marrow
Bone marrow
Mature
Thymus
Bone marrow
Location of mature cell
Mature cell present within the lymph node
Mature cell present out side the lymph node
Receptors
Bear TCR receptors
Bear BCR receptor
Viral antigens
Recognized viral antigens on the outside of infected cells  
Recognized  antigens on the surface of bacteria and viruses
Life span
                Long
Short
Type of immunity
Cell mediated immunity
Humoral or Antibodies mediated immunity
Types of active cell
Cytotoxic T cell , Helper T cell and suppressor / regulatory T cells and memory cells
Plasma cell and memory cells
Surface antigens
Lack of surface antigen
Have surface antigen
Secrete
Lymphokines
Antibodies
%
80% are T lymphocyte
20% are B lymphocyte
Site of infection
Move to the site of infection
Does not move to the site of infection
Tumor cell
Act against tumor cell or transplant
Do not act against tumor cell or transplant
Effect on immune system
Inhibitory effect on immune system
No inhibitory effect on immune system
Functions
·         Lyse virus infected cells and cancer cells
·         Provides immunity against most viruses and few bacteria
·         Aid B cell in antibodies production
·         Modulate immune response
Help eliminate free foreign invaders by enhancing innate immune responses against them
Provide immunity against most bacteria and few viruses

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