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Feedback mechanism is the mechanism of the body to maintain the levels of hormones in the body in the desired limits. An increase or decrease in the levels of the hormones triggers the feedback mechanism.
The body has two types of feedback mechanisms, positive and negative feedback mechanism.
Example:
Negative feedback mechanism:
Whenever there is a change in the normal state, the messages are sent to ‘increase’ secretions if there is a fall below normal or to ‘decrease’ secretions if there is a rise above normal to restore the normal body state. Such a mechanism is called a negative feedback mechanism.
The increase in the blood sugar level stimulates the secretion of insulin so that the sugar level is maintained. If the blood sugar level falls below normal, then it stimulates the secretion of glucagon. Glucagon stimulates the breakdown of glycogen to glucose, and thus, the normal sugar level is maintained.
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Lungs – We have a pair of lungs, which are sac-like structures and covered by a double-layered membrane known as pleura.
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Refractive Index
- The extent of the change in direction that takes place in a given pair of media is expressed in terms of the refractive index.
- It turns out that light propagates with different speeds in different media.
- The value of the refractive index for a given pair of media depends upon the speed of light in the two media.
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Working
- When the current begins to flow, current flows through brush X, then A to B, B to C, C to D and then to brush Y and into the battery.
- Now applying Fleming's Left Hand Rule to wire AB, Current is along AB, Magnetic Field is as shown (North-> South), the motion of the wire is downwards.
- Now applying Fleming's Left Hand Rule to wire CD, Current is along CD, Magnetic Field is as shown (North-> South), the motion of the wire is upwards.
- The rectangular coil begins to move in the anti-clockwise direction
- Note that during anti-clockwise motion, the split rings and axle also move, whereas the brushes don't move.
- After half a rotation, Wire CD and Split ring Q moves to the left. Wire AB and Split ring P moves to right. Brushes X and Y donot move.
- Now applying Fleming's Left Hand Rule to wire CD, Current is along DC. (Battery -> Split ring Q -> DC , Magnetic Field is as shown (North-> South), the motion of the wire is downwards.
- Now applying Fleming's Left Hand Rule to wire AB, Current is along BA. (Battery -> Split ring Q -> DC --> CB -> BA --> Split ring P) , Magnetic Field is as shown (North-> South), the motion of the wire is upwards.
- So, again the coil rotates in the anti-clockwise direction.
- The reversal of current in the coil results in the continous rotation of the coil. The reversal of current is achieved by the commutator rings
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Watershed management is a term used to describe the process of implementing land use practices and water management practices to protect and improve the quality of the water and other natural resources within a watershed by managing the use of those land and water resources in a comprehensive manner.
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The steps involved in generating electricity in a nuclear reactor are:
(i) The controlled fission of uranium-235 in the nuclear reactor produces a lot of heat energy.
(ii) Liquid sodium or C02 gas is pumped continuously through the pipes embedded in reactor. Sodium absorbs the heat energy produced in reactor.
(iii) The hot sodium is then passed into the coil of heat exchanger containing water. The water absorbs heat from hot sodium and gets converted into steam.
(iv) This steam at high pressure is used to rotate the turbine. The shaft of the turbine is connected to the electric generator. When turbine rotates, its shaft also rotates and drives the generator. The generator thus, produces the electricity.
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Yogita Ingle 5 years, 9 months ago
Law of dominance - According to this law, when a cross is made between two homozygous individuals, only one of the two characters of the pair (dominant) appears in the F1 generation. There is the appearance of both the characters in F2 generation.
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