Question

1. Thrombopoiesis is the production of platelets. Which of the following hematopoietic cell types do platelets form from?

   	A.	Lymphocytes
   	B.	Megakaryocytes
   	C.	Neutrophils
   	D.	Monocytes
   	E.	Both B and D
   	F.	Both A and D

1 points   

QUESTION 2

1. Coagulation, also known as blood clotting, requires the activation of a vast number of clotting enzymes. Which of the following clotting enzymes is responsible for the cleavage of fibrinogen (inactive) to fibrin (active)?

   	A.	Plasmin
   	B.	Factor XII
   	C.	Thromboplastin
   	D.	Thrombin
   	E.	None of the above

1 points   

QUESTION 3

1. Following a laceration, there are three major steps that occur that cause the cessation of bleeding. Please put them in the correct order from when the first one starts to when the last one starts.

         -       1.       2.       3.      

   Coagulation

   
         -       1.       2.       3.      

   Platelet Plug Formation

   
         -       1.       2.       3.      

   Vascular Spasm

1.5 points   

QUESTION 4

1. Von Willebrand factor is responsible for preventing the platelets from sticking to the walls of undamaged blood vessels.

   True

   False

0.5 points   

QUESTION 5

1. Which of the following layers of the heart is the most superficial?

   	A.	Myocardium
   	B.	Fibrous Pericardium
   	C.	Endocardium
   	D.	Parietal Pericardium

1 points   

QUESTION 6

1. Which of the following valves does the blood flow through as it leaves the left ventricle?

   	A.	Bicuspid (Mitral Valve) AKA Right atrioventricular valve
   	B.	Tricuspid Valve AKA Left atrioventricular valve
   	C.	Aortic semilunar valve
   	D.	Pulmonary semilunar valve

Answer 1

Answer

1) Thrombopoiesis is the production of platelets. The hematopoietic cell type that platelets form from is : Megakaryocytes

Option B

2) Coagulation, also known as blood clotting, requires the activation of a vast number of clotting enzymes. The clotting enzymes that is responsible for the cleavage of fibrinogen (inactive) to fibrin (active) is : Thrombin

Option D

3) There are three major steps that occur that cause the cessation of bleeding. The correct order of steps is :

1. Vascular spasm
2. Platelet Plug Formation
3. Coagulation

4) Von Willebrand factor is responsible for preventing the platelets from sticking to the walls of undamaged blood vessels. -------- FALSE

- Von Willebrand factor is responsible for binding to proteins and plays role in platelet adhesion to injured sites.

5) The layer of the heart that is the most superficial is : Fibrous pericardium
- It is the most superficial layer of perocardium.
- The most superfical layer of heart is visceral pericardium (epicardium).
Heart has 3 layers : Epicardium, myocardium and endocardium

Option B

6) The valve from which the blood flow through as it leaves the left ventricle is : Aortic semilunar valve
- Blood flows through Aortic semilunar valve to enter the aorta.

Option C