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Signal transduction occurs when an extracellular signaling molecule activates a cell surface receptor. In words, this receptor change intracellular molecules changes a response. There are two levels in this procedure: the signaling molecule activates a particular receptor protein on the cell membrane. A 2nd messenger transfers the signal into the cell and eliciting a physiological response. In either level the signal can be amplified. Whereas, one signalling molecule can cause several responses. Gene activations and metabolism alterations are instances of cellular responses to extracellular stimulation which requires signal transduction.
Describe Gastrovascular cavity in detail? The name given to the internal cavity of cnidarians. A blind-ended (incomplete) gut with only one opening. Food is to be digested and
In designing an experiment to find out whether light is required for photosynthesis (a) what is the principle of the design (b) what control would you use?
How is lymph propelled through the lymphatics? Some of the larger lymphatics are capable to contract, or else the lymph is propelled by body muscles which contract and 'squash'
HOW ARE THE ORIGIN AND EVOLUTION OF ALGAE..
Q. Acute diarrhoea? It must be evident from the table above that acute diarrhoea generally occurs in association with infections, poisons and drugs. Chronic diarrhoea on the ot
The coronary sinus is the main vein of the heart and is about 3 cm. long. It lies in the coronary sulcus at the posterior surface of the heart in the posterior atrio-ventricular g
Q. What are the major harms caused by vitamin A deficiency? How does this vitamin act in the physiology of vision? Deficiency of vitamin A (retinol) may corneal dryness (xeroph
Aortic Stenosis Aortic stenosis is due to an obstructive lesion that interferes with the blood flow out of the left ventricle. Depending upon the site of obstruction to the o
Soil – plant – animal relationship The plants derive the minerals from soil, and the animals from the plants / feed they consume and there is a dependent interrelationship bet
Bio-medical waste management Persons coming in contact with bio-medical waste are prone to get injury from sharps likes needles. Injury due to sharps leads to life threatening
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