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).
Ascorbic Acid (vitamin C) Although the antiscorbptic (preventing the disease scurvy) effects of citrus hits was known for a long time, the first important step towards its
how would i do a project on this?
Define the auditory area of the Cerebrum The auditory area lies immediately below lateral sulcus within the temporal lobe as can be seen in Figure. Cells receive and interpret
Some Physical Features of the Oceans: The oceans are so vast that they stagger one's imagination. They cover more than 70 per cent of the earth's surface. The depth of ocean
how many times more nitrogen then oxygen in the air
Agriculture on a large scale: Crops had to be planted and harvested in the right season. Floods were a recurrent phenomenon in the river valleys, for which it was essent
Explain the Hyposecretion or Hypothyroidism in Adult Life Decreased secretion of thyroid hormone results in the development of myxoedema. There is a slowing of mental and physi
Define Age Related Changes in Blood Blood: Here the haemopoiesis (the formation of blood cells) slows down. Fatty marrows replace the heamopoietic (red) marrow. Thus, the proli
Explain the Chemical Weathering Processes The chemical process of decomposition starts with the physical disintegration of rocks and minerals. In chemical weathering processes
Determine the role of microflora in the soil The microflora in the soil play an important role in the decomposition of dead plants and animal and the recycling of nutrient. Li
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