Q15 / 230 · NTA Abhyas (NEET) 2020 · Zoology · Body Fluids and Circulation
Mechanism of blood clotting is given below:
An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation. An enzyme complex, ______P_______ is formed by a series of linked enzymic reactions (______Q_______process) involving a number of factors present in the plasma in an inactive state. This enzyme complex is required for formation of______R_______. _____S_______ ions play a very important role in clotting.
Identify the correct option that represents P, Q, R, and S.
An injury or a trauma stimulates the platelets in the blood to release certain factors which activate the mechanism of coagulation. An enzyme complex, ______P_______ is formed by a series of linked enzymic reactions (______Q_______process) involving a number of factors present in the plasma in an inactive state. This enzyme complex is required for formation of______R_______. _____S_______ ions play a very important role in clotting.
Identify the correct option that represents P, Q, R, and S.
- A
P Q R S thrombokinase inhibitory prothrombin magnesium - B
P Q R S prothrombin cascade thrombin magnesium - C
P Q R S thrombin cascade thrombokinase calcium - Correct answerD
P Q R S thrombokinase cascade thrombin calcium
Solution
Mechanism of blood coagulation or clotting
A. Injury or trauma results in:
I. Stimulation of platelets Release of certain factors that activate the mechanism of coagulation.
II. Damaged tissues Release of certain factors that can also initiate coagulation.
B. A series of linked enzymic reactions (cascade process) that involves a number of clotting factors present in the plasma in an inactive state is initiated that finally results in the formation of an enzyme complex - Thrombokinase.
C. Prothrombin ---------- Thrombokinase-------- Thrombin
D. Fibrinogens in the plasma ---------- Thrombin-------- Fibrins
- Calcium ions are very important for clotting.
A. Injury or trauma results in:
I. Stimulation of platelets Release of certain factors that activate the mechanism of coagulation.
II. Damaged tissues Release of certain factors that can also initiate coagulation.
B. A series of linked enzymic reactions (cascade process) that involves a number of clotting factors present in the plasma in an inactive state is initiated that finally results in the formation of an enzyme complex - Thrombokinase.
C. Prothrombin ---------- Thrombokinase-------- Thrombin
D. Fibrinogens in the plasma ---------- Thrombin-------- Fibrins
- Calcium ions are very important for clotting.
Hence, the correct answer is option: 'D'.