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Heart beat can be initiated by The ca...

Heart beat can be initiated by
The cardiac pacemaker in a patient fails to function normally . The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of

A

Atrioventricular bundle

B

Purkinje system

C

Sinu-atrial node

D

Atrio-ventricular node

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The correct Answer is:
C
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The cardiac pacemaker in a patient fails to function normally. The doctors find that an artifical pacemaker is to be grafted in him. It is likely that it will be grafted at the site of -

The cardiac pacemaker in a patient falls to function normally.the doctors find that an artificial pacemaker is to be grafted in him.Is is likely that it will be grafted at the site of

Assertion : An artificial pacemaker can replace the SA node of heart. Reasoning : This is because an artificial pacemaker is capable of stimulating the heart electrically to maintain its beats.

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 : An artifical pacemaker can replace the sinoatrial node of heart. Reason : This is because, an artifical pacemaker is capable of stimulating the heart electrically to maintain its beats.

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.

MODERN PUBLICATION-BODY FLUIDS AND CIRCULATION -COMPETITION FILE (Objective Type Questions) (Multiple Choice Question (MCQs))
  1. In humans, blood passes from the post caval to the diastomic right atr...

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  2. the haemoglobin of a human foetus

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  3. Heart beat can be initiated by The cardiac pacemaker in a patient f...

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  4. Heparin is synthesised in

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  5. The vitamin, which is essential for blood clotting is

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  6. Haemoglobin is a: 1. Oligomeric protein 2. Chromoprotein 3. M...

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  7. Blood does not clot inside the vessels because : 1. Constant speedy ...

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  8. Which one of the following is a matching pair

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  9. Haemoglobin is

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  10. "Bundle of His" is formed of mainly:

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  11. Haemophilia is due to absence of:

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  12. Histamine and heparin are secreted by:

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  13. Open circulatory system is present in : (A) Arthropods (B)...

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  14. The opening between the right atrium and the right ventricle is guarde...

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  15. Which of the following is not the cellular element of blood?

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  16. In human beings, duration of cardiac cycle is

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  17. Which of the following statements is related to Starling's law of hear...

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  18. The absence of which clotting factor leads to haemophilia-A?

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  19. What prevents clotting of blood inside the blood vessels?

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  20. In a standard ECG which one of the following alphabets is the correct ...

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