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[A] : Regulation of the rate of breathin...

[A] : Regulation of the rate of breathing is brought about by the respiratory centre of the medulla.
[R]: Because of the changes' In the 002 con- tent of the blood.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Statement I : Rate of breathing is regulated is regulated by respiratory centres present in the medulla oblongata. Statement 2 , Changes in the CO_(2) level of the arterial blood control the rate of breathing.

The respiratory process is regulated by respiratory rhythm centre present in medulla of the brain, which is ?

How pneumotaxic centre regulates the respiratory rate ?

Assertion (A) In brain stem, pons is called pneumotaxic centre with the ability to moderate the function of the ' respiratory rhythm' centre. Reason ( R) Neural signals from the centre can reduce the duration of expiration, thereby alter the respiratory rate

The rate of change of angular momentum of a system of particles about the centre of mass is equal to the sum of external torque about the centre of mass when the centre of mass is :

A long solenoid having n = 200 turns per metre has a circular cross-section of radius a_(1) = 1 cm . A circular conducting loop of radius a_(2) = 4 cm and resistance R = 5 (Omega) encircles the solenoid such that the centre of circular loop coincides with the midpoint of the axial line of the solenoid and they have the same axis as shown in Fig. A current 't' in the solenoid results in magnetic field along its axis with magnitude B = (mu)ni at points well inside the solenoid on its axis. We can neglect the insignificant field outside the solenoid. This results in a magnetic flux (phi)_(B) through the circular loop. If the current in the winding of solenoid is changed, it will also change the magnetic field B = (mu)_(0)ni and hence also the magnetic flux through the circular loop. Obvisouly, it will result in an induced emf or induced electric field in the circular loop and an induced current will appear in the loop. Let current in the winding of solenoid be reduced at a rate of 75 A //sec . Magnetic of induced electric field strength in the circular loop is nearly We know that there is magnetic flux through the circular loop because of the magnetic field of current in the solenoid. For the purpose of circular loop, let us call it the external magnetic field. As current in the solenoid is reducing, external magnetic field for the circular loop also reduced resulting in induced current in the loop. Finally, as the solenoid current becomes zero, external field for the loop also becomes zero and stop changing. However, induced current in the loop will not stop at the instant at which the external field stops changing. This is because induced current itself produces a magnetic field that results in a flux through the loop. External field becoming zero without any further change will compel the induced current in the loop to become zero and so magnetic flux through the loop due to change in induced current will also change resulting in a further induced phenomenon that sustains currents in the loop even after the external field becomes zero.

TRUEMAN BIOLOGY-Animal Physiology -ASSERTION AND REASON
  1. [A] : Extracellular fluid serves as the sanitary drainage line of the...

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  2. [A] : [A]: ECG is a record of electrical activity of the heart that sh...

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  3. [A] : Regulation of the rate of breathing is brought about by the resp...

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  4. [A] : Role of RBC' In CO2 transport Is primarily to form HCO3 - for c...

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  5. [A] : SA node is contraction centre or Pace Maker. [R]: Nodal fibre...

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  6. [A] : Acetylchoiine allows a nerve cell to com- municate chemically w...

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  7. A : Transmission of the nerve impulse across a synapse is accomplishe...

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  8. [A] : CO2 is mainly transported in plasma as HCO3^(-) ions [R]: Th...

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  9. [A] : Conjunctiva is composed of squamous epithelium and lines the eye...

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  10. [A] : Tympanic membrane stretching across the aperture between skull ...

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  11. Assertion : Lateral line system is found in fishes and aquatic larval ...

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  12. [A] : [A]: Parthenogenesis is a type of sexual re- production. [R]: Be...

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  13. [A] : Our inner ear contains sense organs for balance movement of flu...

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  14. [A] : Hair cells on the basiiar membrane are responsible for hearing....

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  15. [A]: Thyroid stimulating hormone is smallest peptide hormone. [R]: ...

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  16. Assertion: Aldosterone is a steroid hormone and is important in the co...

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  17. [A] : Cortisol is a protein hormone that regu- lates gluconeogenesis ...

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  18. [A]: A tadpole whose thyroid gland has been removed does not metamorph...

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  19. [A]: The regulation of RBC production is ac complished by the hormone ...

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  20. [A] : Steroid hormones are similar to choles- terol in structure. [...

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