Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Define Specific Defence Mechanism
In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the culprit. How does a white blood cell know what to attack and what to leave alone? Why doesn't a white blood cell attack every cell in the body? The answer to these questions lies in the discussion below.
The specific defence mechanism provides protection against specific foreign materials. The important characteristic is that its cells (lymphocytes) have an ability to recognize body's own cells and macro molecules (self) from those which are foreign invaders (non self ). It tolerates the 'self' but destroys the 'non self'. The lymphocytes bearing receptor is specific for self i.e. molecules already present in the body, are either made non-functional or destroyed by programmed cell-death known as apoptosis. The lymphocytes that react to non self i.e. foreign molecules are left to function in immune responses.
So, you realize that there is a system built into all of the cells in our body that marks the cells in our body as "self '. Anything that the immune system finds that does not have these markings (or that has the wrong markings) is definitely "not self" and is therefore a fair game. This system is called the Major Histocompatibility Complex (MHC).
what are good conductors of heat?why is advantages to have ventilators in houses at the top of walls?
Reflexes: It is of interest to know, that all sensory information does not have to go to the - brain before we can react to a stimulus. Our responses to certain stimuli
DIAGONAL RELATIONSHIP IN A PERIODIC TABLE
Physical Properties of Amino acid:- Solubility : Amino acids are readily soluble in water, slightly soluble to insoluble in ethanol and insoluble in ether. Tyrosine is solubl
in a reaction 5.3g of sodium carbonate reacted with 6g of ethanic acid. theproducts were 2.2 g of carbon dioxide , 0.9g water and 8.2 g of sodium ethanoate, show that these observa
What is Decarboxylation Reaction and Biogenic Amines What are biogenic amines? Any of a group of naturally occurring, biologically active amines, such as norepinephrine, histam
Explain Ways How Immune System Protect Us 1) It creates a barrier that prevents bacteria and viruses from entering our body. 2) If a bacterium or virus does get into the b
Explain Specific Defence Mechanism In the section on white blood cells, we learnt that whenever a germ or infection enters our body, the WBCs snap to attention and destroy the
Define Systemic Physiology - physiology of growth and development There is a change in the blood count and rate of haemoglobin (Hb) production during the early days. Cardiovasc
Explain Acclimatization - Histotoxic Hypoxia A compensatory respiratory adjustment at moderately high altitudes is called acclimatization. If you were to visit places like Leh
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd