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The state of balance in the internal environment of the body it includes control of the water balance of the blood, body temperature, blood sugar level and blood urea level. Each of these internal factors is maintained by a separate mechanisms the central nervous system and the endocrine system. Before these systems can bring about any change they have to be supplied with information regarding the body state. Living cells and all the chemical reactions are controlled by enzymes; the enzymes are very sensitive to the conditions in which they work (PH). A slight fall in temperature or a rise in acidity may slow down or stop an enzyme from working and thus prevent an important reaction from taking place in the cell.
Cell membrane controls the substances which enter and leave the cell, but it is the tissue fluid which supplies or removes these substances, and it is therefore important to keep the composition of the tissue fluid as steady as possible. If the tissue fluid were too concentrated, it would withdraw water from the cells by osmosis and the body would be dehydrated. If the tissue fluid were too dilute, the cells would take up too much water from it by osmosis and the tissues would become waterlogged and swollen.
Q. Into which two groups can the nitrogen-containing bases that form RNA and DNA be classified? What is the criterion used in to that classification? The nitrogen-containing ba
The North Island saddleback or tieke, Philesturnus rufusater, is an endemic New Zealand bird. Saddlebacks inhabit the middle or lower layers of the forest, and eat small invertebra
Define Reaction of Fehling solution with lactose? After complete reduction of cupric ions, the indicator is reduced by lactose to a leuco compound, restoring the red colour of
How many regulatory enzyme types known in metabolic pathways, explain in detail by giving examples.
Describe the result of Pulmonary Embolism? Results : The mortality in different series is reported between 3 and 36 per cent. In haemodynamically unstable patients this coul
The measurement of blood sugar is of prime importance in the diagnosis and monitoring of patients with diabetes. You can refer sub-section 1.5.2 of Unit 1 to review about Glucose T
Pollution - Environmental Pollution Pollution refers to any undesirable change in the physical, chemical or biological characteristics of our environment, i.e. air, water and
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Lungs - Respiratory Organs In arachnid arthropods such as scorpion and spider, respiration takes place by means of book lungs. There are four pairs of these structures in the
Preformatio n Theory (1632-1723) (i) Scientist 'Malpighi Swammerdam' propounded the preformation theory. This theory holds that the sex cells (sperm and ova) had the m
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