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Blood does not clot inside the vessels b...

Blood does not clot inside the vessels because :
1. Constant speedy flow of blood prevents accumulation of fibrin threads, if at all formed
2. Absence of heparin, an anticoagulant having antithrombin activity, in blood
3. Smoothness of endothelial lining of vessels prevents rupture of platelets to release thromboplastin
4. Presence of monomolecular layer of -vely charged proteins on inner surface of endothelium

A

1, 2 and 3 are correct

B

1 and 2 are correct

C

2 and 4 are correct

D

1 and 3 are correct

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "Blood does not clot inside the vessels because:", we will analyze each of the provided options step by step. ### Step 1: Analyze Option 1 **Statement:** Constant speedy flow of blood prevents accumulation of fibrin threads, if at all formed. - **Explanation:** Blood flows rapidly through the vessels, which means that any fibrin threads that might form due to the clotting process are swept away before they can accumulate. This rapid flow is a significant factor in preventing clot formation. ### Step 2: Analyze Option 2 **Statement:** Absence of heparin, an anticoagulant having antithrombin activity, in blood. - **Explanation:** Heparin is a natural anticoagulant found in the body that helps prevent blood clotting. If heparin were absent, clotting would be more likely to occur. Therefore, this statement is incorrect in the context of why blood does not clot inside vessels. ### Step 3: Analyze Option 3 **Statement:** Smoothness of endothelial lining of vessels prevents rupture of platelets to release thromboplastin. - **Explanation:** The endothelial lining of blood vessels is smooth, which helps prevent the activation of platelets. If platelets do not rupture, they do not release thromboplastin, a substance that is crucial for the clotting process. Thus, this statement supports the idea that blood does not clot inside vessels. ### Step 4: Analyze Option 4 **Statement:** Presence of monomolecular layer of negatively charged proteins on inner surface of endothelium. - **Explanation:** The inner surface of blood vessels contains a layer of negatively charged proteins. This negative charge repels clotting factors and platelets, thereby preventing clot formation. This statement is also correct in explaining why blood does not clot inside vessels. ### Conclusion Based on the analysis: - Option 1 is correct because the flow of blood prevents fibrin accumulation. - Option 2 is incorrect because the absence of heparin would lead to clotting. - Option 3 is correct as the smooth endothelial lining prevents platelet activation. - Option 4 is correct because negatively charged proteins repel clotting factors. Thus, the correct answer is that blood does not clot inside the vessels primarily due to the combination of factors mentioned in options 1, 3, and 4.
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MODERN PUBLICATION-BODY FLUIDS AND CIRCULATION -COMPETITION FILE (Objective Type Questions) (Multiple Choice Question (MCQs))
  1. The vitamin, which is essential for blood clotting is

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

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

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  4. Which one of the following is a matching pair

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  5. Haemoglobin is

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

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  7. Haemophilia is due to absence of:

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  8. Histamine and heparin are secreted by:

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

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

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

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  12. In human beings, duration of cardiac cycle is

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

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

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

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

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  17. The most popularly known blood grouping is the ABO grouping. It is nam...

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  18. Globulins contained in human blood plasma are primarily involved in

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  19. The letter T in T-lymphocytes refers to

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  20. Which of the following matches correctly?

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