Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

In human, the prothrombin required for blood clotting is produced in the liver in the presence of vitamin K. It gets converted into thrombin in the presence of thromboplastin and thus forms an essential step in the clotting process. 

Therefore, the correct answer is option A.

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

The blood component essential for blood coagulation is

  1. Albumin

  2. Globulin

  3. Fibrinogen

  4. Vitamins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Coagulation or clotting is a process where the blood in liquid form turns into a gel. The mechanism involves activation, adhesion and aggregation of platelets and deposition of fibrinogen. Though this is an inactive clotting factor, it helps to clot by the formation of insoluble fibrin.

Therefore, the correct answer is option C.

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

Blood clot inside a blood vessel is known as  

  1. Thrombosis

  2. Agglutinin

  3. Clot

  4. Thrombus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A blood clot that forms inside one of your veins or arteries is called a thrombus. A thrombus may also form in your heart. A thrombus that breaks loose and travels from one location in the body to another is called an embolus.

So, the correct option is 'Thrombus'.

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

Read the statements given below and choose the correct sequence of events leading the formation of a blood clot.
(i) Calcium activates an enzyme.
(ii) Fibrin binds platelets to form a 'plug'.
(iii) Thrombin converts fibrinogen to fibrin.
(iv) Platelets and damaged cells release an activator.

  1. (i), (ii), (iii), (iv)

  2. (ii), (i), (iii), (iv)

  3. (iii), (iv), (i), (ii)

  4. (iv), (i), (iii), (ii)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The process of blood clotting starts with the release of thromboplastin from damaged cells and platelets. Thromboplastin converts plasma protein prothrombin into thrombin in the presence of calcium ions. Thrombin then converts soluble plasma protein fibrinogen into fibrin which binds platelets to form a clot. 
Therefore, the correct answer is option D. 
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

What happens when a clot occurs in an undamaged blood vessel?

  1. The person would bleed to death.

  2. A scab will form on the skin surface.

  3. Platelets stick to the edges of the cut and to one another, forming a plug.

  4. The flow of blood to tissues beyond the clot may be cut off.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a clot occurs in an undamaged blood vessel, It stops the flow of blood to the rest of the tissue beyond the clot as, the blood can't flow through the clot. It causes paralysis in most of the cases. 

Therefore, the correct answer is option D.

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

Which enzyme induces lysis of fibrinogen to fibrin during fibrinolysis?

  1. Plasmin

  2. Thrombin

  3. Fibrin

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

Blood-clotting proteins circulate in the blood plasma in an inactive form, poised to participate in blood coagulation upon tissue injury. Blood-clotting proteins generate thrombin, an enzyme that converts fibrinogen to fibrin, and a reaction that leads to the formation of a fibrin clot.

Therefore, the correct answer is option B.

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 inside the

  1. Liver

  2. Blood

  3. Bone

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

Prothrombin is a coagulation or clotting factor that is needed for the normal clotting of blood. A cascade of biochemical events leads to the formation of the final clot. In this cascade, prothrombin is a precursor to thrombin.
Prothrombin is produced in the liver and is modified in the presence of vitamin K.
Therefore, the correct answer is option A.