The cells that produce the smallest formed elements of the blood are called
1. erythroblasts

2. megakaryocytes

3. myeloblasts

4. thrombocytes

Persons with Rh ____________ blood never exhibit Rh ____________.
1. negative; incompatibility
2. negative; antibodies
3. positive; surface antigens
4. positive; antibodies

What happens during ventricular diastole?
1. both ventricles fill with blood
2. both semilunar valves remain open
3. both AV valves remain closed
4. both ventricles contract

Which part of the specialized conducting system of the human heart is auto-excitable?
I. SA Node II. AV node
III. AV bundle IV. Purkinje fibers
1. I and II only
2. I, II and III only
3. II, III and IV only
4. I, II, III and IV

What is true about the cell shown in the given diagram?

   1. It is rarest WBC found in the blood.

   2. It is the largest WBC

   3. Its number is increased in acute bacterial infections

   4. It is involved in transport of blood gases

Match each item in Column I with one in Column II and choose your answer from the codes given below:

A. Generation             a. AV node of impulse
B. Conduction delay    b. SA node
C. Lub                         c. Closure of semilunar valves
D. Dub                        d. Closure of AV valves

            A.     B.     C.     D.
 1.        a      b       c      d
 2.        b      a       d      c
 3.        a      b       d      c
 4.        b      a       c      d

When the plasma of a person has both anti A and anti B antibodies the blood group of this person would be:

1.  A

2.  B

3.  AB

4.  O

During which stage of the cardiac cycle is the first heart sound produced?

1.  Atrial diastole

2.  Joint diastole

3.  Ventricular systole

4.  Ventricular diastole

A normal event in the process of blood clotting is the

1. production of erythropoietin.

2. conversion of fibrin to fibrinogen.

3. activation of prothrombin to thrombin.

4. increase in platelets.

Serum is-