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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 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.

How pneumotaxic centre regulates the respiratory rate ?

Human beings have a significant ability to maintain and moderate the respiratory rhythm to suit demands of the body. For it we have Respiratory rhythm centre in medulla -R Pneumotaxic centre in pons -RT Chemosensitive area in medulla - C_(1) Peripheral chemoreceptors in aortic arch and carotid artery - C_(2) Find out the correct path for regulation of respiration.

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 :

Fill up the blanks in the following paragraph by selecting the correct option. Human beings have a significant ability to maintain and moderate the respiratory rhythm to suti the demands of the body tissues. This is done by the neural system. A specialised centre present in the medulla region of the brain called overset((i))"_______" is primarily responsible for this regulation. Another centre present in the pons region of the brain called overset((ii))"_______" can moderate the functions of the repiratory rhytm cenre. Neutral signal from this cenre cen reduce the duration of overset((iii))"_______" and thereby alter the respiratory rate. A overset((iv))"_______" is situated adjacent to the rhythm centre which is highly sensitive to CO_(2) and hydrogen ions.

The human ciculatory system can be thought of as a closed system of interconnecting pipes through which fluid is continuously circulated by two pumps the two pumps the right and left verticles of the heart, work as simple two-stroke force pumps. The muscles of the heart regulate the force by contracting and relaxing. the contraction (systole) lasts about 0.2s and a complete systole/diastole (contraction/relaxation) cycle lasts about 0.8s. For flood pressures and speeds in the normal range. the volume flow rate of blood through a blood vessel is directly proportional tot he pressure difference over a length of the vessel and to the fourth power of the radius of the vessel. The total mechanical energy per unit volume of blood just as it leaves the heart is E//V=rhogh+P+rhov^(2) Q. Why is diastolic blood pressure muchh lower than systolic pressure? A. because the heart exerts more force on the blood during diastole B. Because the heart exerts no force on the blood during diastole C. Because the radii of the blood vessels increase during diastole while the force exerted by the heart on the blood remains the same. D. Because the radii of the blood vessels increase during diastole while the force exerted by the heart on the blood remains the same.

Which of the following statements are true about the brain? (i) The main thinking part of brain is hind brain. (ii) Centres of hearing, smell, memory, sight, etc., are located in fore brain (iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain. (iv) Cerebellum does not control posture and balance of the body.

The rate of reaction increases isgnificantly with increase in temperature. Generally, rate of reactions are doubled for every 10^(@)C rise in temperature. Temperature coefficient gives us an idea about the change in the rate of a reaction for every 10^(@)C change in temperature. "Temperature coefficient" (mu) = ("Rate constant of" (T + 10)^(@)C)/("Rate constant at" T^(@)C) Arrhenius gave an equation which describes aret constant k as a function of temperature k = Ae^(-E_(a)//RT) where k is the rate constant, A is the frequency factor or pre-exponential factor, E_(a) is the activation energy, T is the temperature in kelvin, R is the universal gas constant. Equation when expressed in logarithmic form becomes log k = log A - (E_(a))/(2.303 RT) Activation energies of two reaction are E_(a) and E_(a)' with E_(a) gt E'_(a) . If the temperature of the reacting systems is increased form T_(1) to T_(2) ( k' is rate constant at higher temperature).

In nature, the failure of structural members usually result from large torque because of twisting or bending rather than due to tensile or compressive strains. This process of structural breakdown is called buckling and in cases of tall cylindrical structures like trees, the torque is caused by its own weight bending the structure. Thus, the vertical through the centre of gravity does not fall within the base. The elastic torque caused because of this bending about the central axis of the tree is given by (Ypir^(4))/(4R) . Y is the Young's modulus, r is the radius of the trunk and R is the radius of curvature of the bent surface along the height of the tree containing the centre of gravity (the neutral surface). Estimate the critical height of a tree for a given radius of the trunk.

Pick out the correct statements: a) Pneumotaxic centre moderates the functioning of respiratory rhythm centre. b) Pneumotaxic centre is primarily responsible for regulation of respiratory movements. c) Decrease in pH of cerebrospinal fluid is detected by medulla. d) The role of carbon dioxide in the regulation of respiratory rhythm is quite insignificant.

TRUEMEN BIOLOGY ENGLISH-Animal Physiology -ASSERTION AND REASON
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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 - in p...

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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]: Parthenogenesis is a type of sexual reproduction. [R]: Because y...

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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 cholesterol in structure. [R]...

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