regulation d changes

Different living organisms tide over very low or very high temperature conditions differently. For E.g., i) Encystment It involves the formation of a hard and chitinous protective coat called cyst, around the body. It is commonly seen in amoeba, euglena. ii) Hibernation (winter sleep) Some animals ..

The heart is regulated to a large extent through the central nervous system. The heart nerve branches from the vagus nerve from the medulla oblongata and the sympathetic nerve fibres from the spinal cord. The vagus nerves are cardiac inhibitory nerves. When the vagus nerve is stimulated, ..

The water level in the blood changes the volume of the blood which affects the blood pressur..

Hormones are informational molecules. They are secreted in response to changes in the environment inside or outside the body. These are released into the extracellular fluid, where they are diffused into the blood stream. The latter carries them from the site of production to the site of ..

In eukaryotes, the genes that code for the enzymes needed to catalyse the various steps of a particular metabolic pathway may not be adjacent or even be in different chromosomes. However, these genes are regulated by operon model as in bacteria. Both the inducible and the repressible syst..

The change in free energy may be expressed as D G = D E + D (PV) - D (TS) If the process is carried out at constant temperature and pressure, the terms D (PV) and D (TS) become D (PV) = P D V and ..

The internal energy of a system depends upon the state of the system and not on how the system reached the state. The absolute value of internal energy possessed by a substance or system cannot be calculated because it is not possible to find the accurate values of different types of energies, such..

We know that in chemical reactions, energy is required to break old bonds of the reactants. Energy is also released to form new bonds, which give the end products. The net energy change (released or absorbed) in a reaction will be equal to energy required to break all the bonds in reacta..

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Physical and Chemical Changes..