Home
Class 12
BIOLOGY
[A]: in mammalian heart there is a very ...

[A]: in mammalian heart there is a very swift conduction of stimulation all over the body.
[R]: Conduction of stimulation is caused by Purkinje fibres and Bundle of His

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

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ANIMAL KINGDOM -NONCHORDATES

    TRUEMAN BIOLOGY|Exercise MCQ|283 Videos

  • APPLICATION OF BIOTECHNOLOGY

    TRUEMAN BIOLOGY|Exercise Multiple Choice Questions|122 Videos

Similar Questions

Explore conceptually related problems

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/t the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The temperature of this new wire is again raised from 10^@C to 110^@C The percentage increase of his resistance would be

Given these structures of the conduction system of the heart 1. Bundles of His 2. AV node 3. Bundle branches 4. Purkinje fibres 5. SA node Choose the arrangement that lists the structures in an order of an action potential passes through them.

TRUEMAN BIOLOGY-Animal Physiology -ASSERTION AND REASON
  1. [A] : The heart of birds is more advanced than the four chambered hear...

    Text Solution

    |

  2. A : Portal system consists of veins which start from capillaries and e...

    Text Solution

    |

  3. [A]: in mammalian heart there is a very swift conduction of stimulatio...

    Text Solution

    |

  4. [A] : Reduced blood can carry more CO2 than oxygenated blood. [R]:...

    Text Solution

    |

  5. [A] : The central nervous system regulates the release of saliva from ...

    Text Solution

    |

  6. [A] : Gall stones are pebble sized structures that formed in the gall...

    Text Solution

    |

  7. [A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are...

    Text Solution

    |

  8. [A]: Osteoporosis is a bone disorder that results from the loss of cal...

    Text Solution

    |

  9. [A] : In mammals, ends of presynaptic fibres are enlarged to form syn...

    Text Solution

    |

  10. [A] : Receptors located in tendons, joints and skeletal muscle give in...

    Text Solution

    |

  11. [A]: Lateral-line organs are important in connection with aquatic mode...

    Text Solution

    |

  12. [A] : Accomodation in the bird's eye is con- trolled by the ciliary ap...

    Text Solution

    |

  13. [A] : Mammals lack mucous glands in their skin. [R] : The epidermis ...

    Text Solution

    |

  14. [A] : In old age, the skin gets wrinkled. [R]: Epidermis has a sin...

    Text Solution

    |

  15. [A] : In Mammals sweat glands are primarily concerned with regulation...

    Text Solution

    |

  16. [A] : [A]: Spermatogenesis occurs in the seminiferous tubules of the t...

    Text Solution

    |

  17. Statement 1 : In a Graafian follicle, the primary cell, the and the f...

    Text Solution

    |

  18. [A] : Amniotic fluid serves as a protective cushion. [R]: It breaks...

    Text Solution

    |

  19. [A]: Entry of sperm brings about a rearrangement of materials of cytop...

    Text Solution

    |

  20. A : in morula stage the cells divide without any increase in siz...

    Text Solution

    |