Tag: blood clotting and healing of wounds

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Questions Related to blood clotting and healing of wounds

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

In a resting person, the saturation level of haemoglobin as blood leaves the tissue capillaries is approximately

  1. 75%

  2. 40%

  3. 3%

  4. 46%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The relationship between oxygen levels and hemoglobin saturation is indicated by the oxygen-hemoglobin dissociation (saturation) curve at high partial pressures of O2 (above about 40 mm Hg), hemoglobin saturation remains rather high (typically about 75 - 80%). This rather flat section of the oxygen-hemoglobin dissociation curve is called the 'plateau'. 40 mm Hg is the typical partial pressure of oxygen in the cells of the body. Examination of the oxygen-hemoglobin dissociation curve reveals that, under resting conditions, only about 20 - 25% of hemoglobin molecules give up oxygen in the systemic capillaries. This is significant (in other words, the 'plateau' is significant) because it means that you have a substantial reserve of oxygen. In other words, if you become more active, & your cells need more oxygen, the blood (hemoglobin molecules) has lots of oxygen to provide When you do become more active, partial pressures of oxygen in your (active) cells may drop well below 40 mm Hg.

So, the correct option is '75%'.

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

The process of blood clot formation within the circulatory system is

  1. Thrombosis

  2. Thrombocytes

  3. Thrombin

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

Thrombosis is the formation of a blood clot inside a blood vessel, obstructing the flow of the blood through the circulatory system.
Thrombocytes are also called 'platelets' and these are the blood cells, whose function is to stop bleeding.
Thrombin is the enzyme that converts fibrinogen to fibrin, and a reaction that leads to the formation of fibrin clot.
Thrombocytopenia is the disorder in which there is an abnormally low amount of platelets.
Thus, the correct answer is option (A).

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

Platelets are a source of ______________.

  1. Fibrinogen

  2. Calcium

  3. Thromboplastin

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

Thromboplastin is a plasma protein aiding blood coagulation through catalyzing the conversion of prothrombin to thrombin. It is a complex enzyme that is found in brain, lung, and other tissues and especially in blood platelets and that functions in the conversion of prothrombin to thrombin in the clotting of blood—called also thrombokinase.


So, the correct answer is 'Thromboplastin'.

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

Blood clotting vitamin is?

  1. A
  2. $B _6$
  3. $B _{12}$

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

Vitamin K plays a key role in helping the blood clot, preventing excessive bleeding. Unlike many other vitamins, vitamin K is not typically used as a dietary supplement. Vitamin K is actually a group of compounds. The most important of these compounds appears to be vitamin K1 and vitamin K2


So, the correct answer is 'K'.

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

When whole blood is stored with an anticoagulant at $4^oC$, the K+ ions move out from the RBC into the plasma. The most likely reasons for this is that

  1. RBC haemolyses and hence leakage of K+ ions
  2. K+ ions become more mobile at $4^oC$

  3. Active transport ceases resulting in ionic equilibrium

  4. The anticoagulant attracts the K+ ions into the plasma
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice biology soldiers of defense blood clotting and healing of wounds coagulation of blood blood clotting

Which of the following statements are correct?


(i) $Ca^{+2}$ is necessary for blood coagulation.
(ii)Coagulation in blood vessel is prevented during normal condition by heparin.
(iii)Clotting of blood involves changes of fibrinogen to fibrin by thrombin.
(iv)Blood clotting involves cascading process involving a number of factors present always in the active form.

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

  2. (ii) and (iv)

  3. (i) and (iii)

  4. (iii) and (iv)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ca${+2}$ is necessary for blood coagulation -

1. Conversion of prothrombin to thrombin, in presence of prothrombin activator and Ca${+2)$
2. Conversion of fibrinogen monomers in to fibrin fibres  
III fibrinogen is thin soluable protein that is converted to insoluable protein fibres by thrombin
So, the correct answer is 'i and iii'

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

Identify $A,B$ and $C$ in the given blood clotting process.
Damage platelets release $A$;$A$ converts $D$ into $B$ in presence of Calcium ions. $B$ converts $C$ into Fibrin thread.

  1. A-Thromboplastin,B-Prothrombin,C-Fibrinogen

  2. A-Thrombin,B-Fibrinogen,C-Thrombo-kinase

  3. A-Thromboplastin,B-Thrombin,C-Fibrinogen

  4. A-Prothrombin,B-Thrombin,C-Fibrinogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the clotting cascade, damaged platelets release thromboplastin (A), which converts prothrombin (D) into thrombin (B) in the presence of calcium. Thrombin then converts fibrinogen (C) into fibrin threads.

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

The anticoagulant most commonly used to store blood in the blood banks is

  1. Sodium nitrate

  2. Sodium fluoride

  3. EDTA

  4. Acid citrate dextrose
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Acid citrate dextrose solution (anticoagulant citrate dextrose solution) is a solution of citric acid, sodium citrate and dextrose in water. It is mainly used as an anticoagulant to preserve blood specimens required for tissue typing because it removes the calcium ion which plays an important role in blood clotting reaction.