Home
Class 11
BIOLOGY
Assertion : The enlarged Q and R waves i...

Assertion : The enlarged Q and R waves indicate myocardial infarction
Reason : Any deviation in the normal recording of ECG indicates possible abnormality or disease.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
B
A normal electrocardiogram (ECG) is composed of P wave, a QRS wave (complex) and a T wave. The ECGs obtained from different individuals have roughly the same shape and any deviation from this shape indicates a possible abnormality or disease. For example, the enlarged Q and R wave indicate a myocardial infraction (heart attack), enlargement of the P wave indicates enlargement of the atria. T wave is flat when the heart muscles receive insufficient oxygen as in atherosclerotic heart disease.
Promotional Banner

Topper's Solved these Questions

  • BIOMOLECULES

    NCERT FINGERTIPS|Exercise Biomolecules|137 Videos

  • BREATHING AND EXCHANGE OF GASES

    NCERT FINGERTIPS|Exercise Breathing And Exchange Of Gases|140 Videos

Similar Questions

Explore conceptually related problems

A cardiologist observed an enlarged QR wave in the ECG of a patient. What does it indicate ?

Assertion : Regular cyclic menstruation is an indicator of normal reproductive phase . Reason : It occurs throughout the reproductive phase of normal female .

Assertion : ECG is of immense diagonstic value in the cardiac diseases. Reasoning : Defects in cardiac functions can be reflected in changes in the pattern of electrical potential recorded in the ECG.

Assertion: The name of any restriction endonuclease ends with a Romen number Reason :Romen number indicate the ordeer in which the enzyme were discovered from that strain of bacteria

Assertion :- In human genetic, pedigree study provides a strong tool, which is utilized to trace the inheritance of a specific trait, abnormality or disease. Reason :- The controlled crosses that can be perfoemed in pea plant or same other organism, are not possible in case of human beings.

Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion (c) If the assertion is true but the reason is false (d) If both the assertion and reason are false (e) If the assertion is false but reason is true Assertion : Electorcardiogram is record of electrical activity of the heart which shows certain waves called P,Q,R,S and T waves. Reason : It gives important information concerning the spread of excitation to the different parts of heart and it is of value in the diagnosis of cases of abnormal cardiac rhythm and myocadial damage.

Assertion : Any ray of light suffers a deviation of (180^@-2i) after one reflection. Reason : For normal incidence of light deviation is zero.

NCERT FINGERTIPS-BODY FLUIDS AND CIRCULATION-Body Fluids And Circulation
  1. Which of the following correctly explains a phase/event in cardiac cyc...

    Text Solution

    |

  2. Which of the following statements is incorrect ?

    Text Solution

    |

  3. What would be the cardiac output of a person having 72 heart beats per...

    Text Solution

    |

  4. Match the terms given under column 'A' with their functions given unde...

    Text Solution

    |

  5. Read the following statements and choose the correct option Statemen...

    Text Solution

    |

  6. Assertion : RBCs are devoid of nucles in most of the mammals Reason ...

    Text Solution

    |

  7. Assertion : Type 'O' blood group individuals are called universal dono...

    Text Solution

    |

  8. Assertion : Fibrins are formed by the conversion of inactive fibrinoge...

    Text Solution

    |

  9. Assertion : The process of clotting can occur in absence of all cellul...

    Text Solution

    |

  10. Assertion : Lymph in lymphatic system is known as tissue fluid Reaso...

    Text Solution

    |

  11. Assertion : Closed circulatory system is less efficient than open circ...

    Text Solution

    |

  12. Assertion : Double circulation is incomplete in amphibians and reptile...

    Text Solution

    |

  13. Assertion : There is no mixing of oxygenated and deoxygenated blood in...

    Text Solution

    |

  14. Assertion : Left atrium has the thickest muscles Reason : Right atri...

    Text Solution

    |

  15. Assertion : Sino-atrial node (SAN) is called the pacemaker Reason : ...

    Text Solution

    |

  16. Assertion : Atria act as primer pumps that increase the ventricular pu...

    Text Solution

    |

  17. Assertion : There are 72-75 heart beats per minute on an average when ...

    Text Solution

    |

  18. Assertion : The cardiac output of an ordinary man and of an athlete is...

    Text Solution

    |

  19. Assertion : The enlarged Q and R waves indicate myocardial infarction ...

    Text Solution

    |

  20. Assertion : Neutral signals through sympathetic nerves can increase th...

    Text Solution

    |