Tag: soldiers of defense

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Questions Related to soldiers of defense

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

An anticoagulant is

  1. Heparin

  2. Hirudin

  3. EDTA

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Heparin is a natural anticoagulant in the body. Hirudin is an anticoagulant produced by leech while sucking the blood of the host. EDTA acts as an anticoagulant by removing calcium ions from the blood and thus chelates with them.

Thus, the correct answer is option D. 

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

During blood clotting, fibrin is produced by

  1. Thrombokinase

  2. Prothrombin

  3. Liver

  4. Proteolysis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
During the process of blood clotting, platelets release thromboplastin which converts prothrombin into thrombin. This thrombin in the presence of calcium ions is responsible for conversion of fibrinogen into insoluble fibrin, thus forming a clot
So, the correct answer is 'Prothrombin'
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

During blood clotting, which of the following is used?

  1. Co
  2. $Ca^{++}$
  3. $Na^+$
  4. $Cl^-$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood clotting (coagulation) is the process by which blood vessels repair ruptures after injury. Calcium works together with vitamin K and a protein, called as fibrinogen in the clotting cascade, which forms fibrin. The fibrin hardens very quickly to form a scab over the wound. 

Hence, correct answer is option B.

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

Prothrombin is found in

  1. Intestine and helps in cellulose digestion

  2. Liver and helps in production of bile

  3. Blood and gives red colour to blood

  4. Blood and helps in blood clotting
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prothrombin is a plasma protein which is converted into thrombin in the presence of thromboplastin released by platelets at the site of injury. The thrombin then converts protein fibrinogen into insoluble fibrin and thus aids in blood clotting. 

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

Which of the following does not play a role in blood coagulation?

  1. Vitamin K

  2. Vitamin D

  3. Calcium ions

  4. Fibrinogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coagulation (also known as clotting) is the process by which blood changes from a liquid to a gel, forming a clot. The activation of some of the enzymes in the coagulation cascade is dependent on vitamin K. In the presence of other plasma proteins (clotting factors) and calcium ions, this leads to the activation of a protein called as factor X. 

Fibrinogen or factor I is a blood plasma protein that is made in the liver. It is one of 13 coagulation factors responsible for normal blood clotting. 
Vitamin D is required for the formation of strong bones and does not play any role in blood clotting. 
Hence, the correct answer is option B.

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

The function of vitamin K is in

  1. Regulation of calcium and phosphorus metabolism

  2. Blood clotting

  3. Respiration

  4. Carbohydrate metabolism
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Vitamin K plays an important role in blood clotting. It is required by the body for the synthesis of prothrombin by the liver. Prothrombin is a plasma protein which gets converted into thrombin during the clotting process and thus helps in clotting mechanism. Thus, the correct answer is option B. 

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

An anticoagulant used for preventing clotting in vitro is sodium oxalate. It prevents clot formation by

  1. Combining with cations in the blood

  2. Inhibiting clotting factor VIII activity

  3. Getting itself deposited over the surface of ROC

  4. Blocking the fibrinogen activity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium oxalate (like citrates) can be used to remove calcium ions (Ca$^{2+}$) from the blood plasma. The oxalate prevents clotting by forming insoluble calcium salts, thus removing ionic calcium (or cations).
Therefore, the correct answer is option A.

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

In human, the prothrombin required for blood clotting is produced in

  1. Liver

  2. Stomach

  3. Pancreas

  4. Spleen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Prothrombin is a plasma glycoprotein produced in the liver. It gets converted into thrombin by a clotting factor prothrombinase which further transforms fibrinogen into fibrin which combines with platelets to form clot. 

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

Blood doesn't clot in the absence of vitamin K because it is

  1. An essential component of the clot

  2. An essential component of the platelets

  3. Essential for synthesis of prothrombin

  4. Essential for synthesis of fibrinogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Blood clotting factors are needed for blood to clot (coagulation). Prothrombin, or factor II, is one of the clotting factors made by the liver. Vitamin K is needed to make prothrombin and other clotting factors. So, blood does not clot in the absence of Vitamin K because it is essential for the synthesis of prothrombin and not because it is an essential component of the clot, platelets or essential for fibrinogen. 

Thus, the correct answer is option C.