Choose the correct order for the steps of hemostasis:

1. Blood coagulation, platelet plug formation, blood vessel spasm

2. Platelet plug formation, blood coagulation, blood vessel spasm

3. Blood vessel spasm, platelet plug formation, blood coagulation

4. Blood vessel spasm, blood coagulation, platelet plug formation

Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body.

(1) Erythrocytes                       

(2) Leucocytes

(3) Neutrophils                         

(4) Thrombocytes

Which of the following is known as Christmas factor?

1. factor VIII               

2. factor XII

3. factor IV                 

4. factor IX

The component of blood which prevents its coagulation in the blood vessels is

(1) haemoglobin

(2) plasma

(3) thrombin

(4) heparin.

Which of the following diseases is also called Christmas disease?

(1) Sickle-cell anaemia

(2) Haemoglobinuria

(3) Myocardial infarction

(4) Haemophilia-B