Tag: soldiers of defense

Questions Related to soldiers of defense

During blood coagulation, vitamin K helps in

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Formation of prothrombin

  2. Formation of thromoboplastin

  3. Conversion of fibrinogen into fibrin

  4. Conversion of prothrombin to thrombin.

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Correct Option: A

Blood protein which initiates blood coagulation is

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Prothrombin

  2. Thrombin

  3. Fibrinogen

  4. Fibrin

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Correct Option: A
Explanation:
Prothrombin is a plasma protein essential for blood clotting. Whenever there is an injury, prothrombin activator complex is formed. Prothrombin is converted into thrombin by activators. Thrombin acts as an enzyme and converts plasma protein fibrinogen into fibrin threads which form a clot at the site of injury and bleeding is stopped.
So, the correct answer is 'Prothrombin'.

Which one of the following substances, if introduced in blood stream would cause coagulation of blood at the site of its introduction?

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Prothrombin

  2. Fibrinogen

  3. Thromboplastin

  4. Heparin.

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Correct Option: C

Find the correct explanations about blood not clotting inside the vessels
1. Speedy flow prevents accumulation of fibrin threads if formed
2. Absence of anticoagulant heparin having antithrombin activity
3. Smoothness of endothelial lining preventing rupturing of platelets and formation of thromboplastin
4. Presence of a layer of negetively charged protein over the inner surface of endothelium that attracts clotting factors.

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. 1, 2, 3 correct

  2. 1, 2 correct

  3. 2, 4 correct

  4. 1, 3 correct.

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Correct Option: D

Which one of the following proteins is involved in the coagulation of blood

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Globulin

  2. Fibrinogen

  3. Albumin

  4. Serum amylase.

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Correct Option: B

In extrinsic clotting pathway, active factor VI activates factors

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. X and XI

  2. IX and X

  3. IX and XI

  4. XI and XII.

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Correct Option: B

Which one functions as enzyme in blood clotting

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Prothrombin

  2. Calcium

  3. Thrombin

  4. Fibrin.

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Correct Option: C

Identify the correct sequence of blood coagulation (a) Activation of prothrombin (b) Formation of prothrombin activator (c) Formation of blood clot (d) Conversion of fibrinogen to fibrin

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. b - d - a - c

  2. b - a - d - c

  3. a - d - c - b

  4. a - b - c - d

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Correct Option: B
Explanation:
Blood coagulation occurs in the following sequence:
  • Whenever there is rupture of blood vessels or damage is caused to blood, a complex of substances called prothrombin activator complex is formed. 
  • The activators convert prothrombin into thrombin.
  • Thrombin acts as an enzyme and converts fibrinogen into fibrin threads.
  • Fibrin threads accumulate and clump to form blood clot at the wound site.
So, the correct answer is 'b- a- d- c'.

The factor which initiates intrinsic pathway of blood clotting and triggers cascade reaction is

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Antihaemophiliac factor (VIII)

  2. Christmas factor (IX)

  3. Stuart-Prower factor (X)

  4. Hageman's factor (XII).

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Correct Option: D

Thrombokinase is associated with

biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

  1. Elimination of area and other excretory products from the body

  2. Production of erythrocytes from the bone marrow

  3. Pulmonary and systemic circulation

  4. Cardiac cycle and its regulation

  5. Enzymatic reactions in coagulation of blood.

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Correct Option: E