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Blood enters the heart because muscles o...

Blood enters the heart because muscles of the

A

Atria relax

B

Ventricles contract

C

Ventricles relax

D

Atria contract

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The correct Answer is:
A
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MODERN PUBLICATION-BODY FLUIDS AND CIRCULATION -COMPETITION FILE (Objective Type Questions) (Multiple Choice Question (MCQs))
  1. Artery is a blood vessel which carries blood

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  2. Which animal has most mixing of oxygenated and deoxygenated blood in t...

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  3. Blood enters the heart because muscles of the

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  4. In humans, blood passes from the post caval to the diastomic right atr...

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  5. the haemoglobin of a human foetus

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

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  7. Heparin is synthesised in

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

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

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

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  11. Which one of the following is a matching pair

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  12. Haemoglobin is

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

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  14. Haemophilia is due to absence of:

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  15. Histamine and heparin are secreted by:

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

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

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

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  19. In human beings, duration of cardiac cycle is

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

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