Home
Class 11
BIOLOGY
Assertion : Sino-atrial node (SAN) is ca...

Assertion : Sino-atrial node (SAN) is called the pacemaker
Reason : SAN generates the maximum number of action potentials and is responsible for intiating and maintaining the rhythmic contractions of the heart.

A

both Assertion and Reason are true and the Reason is the correct explanation of the Assertion,

B

both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

C

Assertion is true statement but Reason is false

D

both Assertion and Reason are false statements

Text Solution

Verified by Experts

The correct Answer is:
A
Sino-atrial node (SAN) ia a patch of nodal tissue is present in right upper corner of right atrium.
Promotional Banner

Topper's Solved these Questions

  • BODY FLUIDS AND CIRCULATION

    A2Z|Exercise Section A : Topicwise Questions Topic 5: Double Circulation And Regulation Of Cardiac Activity|32 Videos

  • BODY FLUIDS AND CIRCULATION

    A2Z|Exercise Section A : Topicwise Questions Topic 6: Sisorder Of Circulatory System|15 Videos

  • BODY FLUIDS AND CIRCULATION

    A2Z|Exercise Section A : Topicwise Questions Topic 3: Coagulation Of Blood And Tissue Fluid (lymph)|15 Videos

  • BIOMOLECULES

    A2Z|Exercise Section D: Chapter End Test|50 Videos

  • BREATHING AND EXCHANGE OF GASES

    A2Z|Exercise Section D: Chapter-end Test|50 Videos

Similar Questions

Explore conceptually related problems

Sino-atrial node is called the pacemaker of our heart. Why?

What is the maximum number of action potential generated by SAN?

Assertion : The sino-atrial node (SAN) is called the pacemaker. Reason : SAN is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart during a cardiac cycle. c. The cardiac output of a normal man will be much lesser than an athlete. d. The wall of right ventricle is much thicker than the left ventricle e. In pisces the two separate circulatory pathways are present, hence they have double circulation. f. The clsoed circulatory pattern is considered to be more advantageous than open circulatory pattern. g. Glucose is absorbed by simple diffusion through lymph in lacteales present in the intestinal villi. h. The SAN can generate the maximum number of action potential i.e. 140-150 mi n^(-1) in neonates, and is responsible for initiation and maintenance of the rhythmic contractile activity of the heart. i. Angina can occur in any age but more common among the neonates and infants. j. heart failure is sometimes called congestive heart failure because congestion of the blood vessels is one of the main symptoms of this disease.

Number of action potentials that can be generated by sino-atrial node is

Assertion: SAN is also called pacemaker. Reason: SAN sets the pace of the activities of the heart.

The SAN generates an action potential which stimulates both the atria to undergo a simultaneous contraction and this is know as the ………..

Which of the following statements are correct about Sino-atrial node A) It is responsible for initiating and maintaining the rhythmic contractile activity of the heart B) It is auto-excitable and generates 70 - 75 action potentials per minute C) It sets the pace of the activities of the heart and is called pacemaker

Assertion: SA node malfunctioning leads to disturbance of Heart rat Reason: SA node is the pacemaker of heart producing electric impulse for heart contraction

A2Z-BODY FLUIDS AND CIRCULATION -Section A : Topicwise Questions Topic 4: Circulatory Pathways
  1. Recognise the figure and find out the correct matching.

    Text Solution

    |

  2. The atrium and ventricle of same side are separated by a thick fibrous...

    Text Solution

    |

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

    Text Solution

    |

  4. Match the colums I and II, and choose the correct combination from the...

    Text Solution

    |

  5. Another mass of nodal tissue called atrio-ventricular node (AVN) is pr...

    Text Solution

    |

  6. A bundle of nodal fibres, which continues from the AVN which passed th...

    Text Solution

    |

  7. On the top of inter-ventricular septum AV bundle immediately divides a...

    Text Solution

    |

  8. Right and left bundle give rise to minute fibres throughout the ventri...

    Text Solution

    |

  9. Pukinje fibre along with right and left bundles are known as

    Text Solution

    |

  10. The maximum number of action potentials are generated by

    Text Solution

    |

  11. Which is correct about joint diastole? a. Bicuspid and tricuspid val...

    Text Solution

    |

  12. In this figure, peak point (a) is represented by letter

    Text Solution

    |

  13. The atrial systole increase the flow of blood into the ventricles by a...

    Text Solution

    |

  14. What will happen during the ventricular systole? a. Bicuspid and tri...

    Text Solution

    |

  15. During a cardiac cycle, each ventricle pump out blood which is called

    Text Solution

    |

  16. The body has ability to alter the

    Text Solution

    |

  17. Match the column I and II, and choose the correct combination from the...

    Text Solution

    |

  18. How many cardiac cycles performed per minute?

    Text Solution

    |

  19. Number of beats pwe minutes is called

    Text Solution

    |

  20. The graphical representation of the electrical activity of the heart d...

    Text Solution

    |