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Read the following statements and select...

Read the following statements and select the correct option
Statement 1 : The SA node acts as pacemaker
Statement 2 : The SA node is located in the wall of the right atrium near the interatrial septum

A

Both statements 1 and 2 are correct

B

Statement 1 is correct but statement 2 is incorrect

C

Statement 1 is incorrect but statement 2 is correct

D

Both statements 1 and 2 are incorrect

Text Solution

Verified by Experts

The correct Answer is:
B
The heartbeat originates from the SA node which acts as a pacemaker. SA node lies in the wall of the right atrium near the opening of the superior vena cava.
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NCERT FINGERTIPS ENGLISH-BODY FLUIDS AND CIRCULATION-Body Fluids And Circulation
  1. Heart pumps blood more forcefully in older persons than younger ones d...

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  2. Pacemaker is situated in the

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  3. Read the following statements and select the correct option Stateme...

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  4. In which one of the following pairs, two terms represent the same thin...

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  5. Read the following statements and select the correct ones (i) Nodal ...

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  6. The given figure illustrates a section through the human heart. W...

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  7. Chordae tendineae are found in

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  8. The problem of electrical discontinuity caused in the normal heart by ...

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  9. Match column I with column II and select the correct option from the c...

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  10. Blood enters the heart because muscles of the

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  11. During ventricular systole

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  12. If due to some injury the chordae tendineae of the tricuspid valve of ...

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  13. In humans, blood passes from the post caval to the diastolic right atr...

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  14. The figure given below shows three stages in the cardiac cycle Wh...

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  15. A red blood cell, entering the right side of the heart passes by or th...

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  16. What happens when the pacemaker becomes nonfunctional ?

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  17. In the given figure the durations of the events of the cardiac cycle a...

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  18. Which of the following statements (s) regarding the cardiac system is/...

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  19. In a cardiac output of 5250 mL per minute, with 75 heartbeats per minu...

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  20. Rate of heartbeat is determined by

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