A+P

27. Which of the following is not a property of erythrocytes?

A. absence of nuclei
B. containing hemoglobin
C. smaller than leukocytes
D. spherical shape
E. carrying oxygen

28. Which of the following nutrients except ____ are especially needed for production of hemoglobin?

A. vitamine D
B. vitamine B12
C. folic acid
D. iron

29. Which of the following is not involved in hemostatsis (stoppage of bleeding) ?

A. clot formation
B. agglutination
C. conversion of fibrinogen to fibrin polymers
D. platelet plug formation
E. constriction of the blood vessel

30. Blood clot is not formed in unbroken blood vessels due to two of the following factors.
1) fast blood flow 2) smooth inner surface of blood vessels 3) high leukocyte count 4) high platelet count 5) high erythrocyte count

A. 1 and 2
B. 2 and 5
C. 3 and 4
D. 2 and 3
E. 1 and 5

31. Platelets have all of the following properties except that ____.

A. platelets facilitate coagulation
B. platelets help repair broken blood vessels.
C. platelets kill bacteria.
D. platelets aggregate at broken blood vessels
E. platelets are fragments of megakaryocytes.