21. What is the primary function of white blood cells in the body?
a) Producing antibodies
b) Maintaining hemostasis
c) Regulating blood cell production
d) Defending against intruders
22. Which type of white blood cells are the most numerous and highly phagocytic?
a) Eosinophils
b) Basophils
c) Neutrophils
d) Monocytes
23. What is the process by which white blood cells squeeze out of blood capillaries?
a) Diapedesis
b) Phagocytosis
c) Hemostasis
d) Thrombopoiesis
24. Which type of blood cell is responsible for releasing substances like heparin and histamine?
a) Lymphocytes
b) Eosinophils
c) Basophils
d) Neutrophils
25. What is the main role of platelets in the blood?
a) Producing antibodies
b) Releasing enzymes for digestion
c) Maintaining hemostasis and clotting
d) Phagocytosis of bacteria
26. Which of the following is a condition characterized by an increased count of platelets?
a) Thrombocytopenia
b) Leukocytosis
c) Thrombocytosis
d) Leukopenia
27. What role do hematopoietic growth factors (HGFs) play in blood cell production?
a) They produce antibodies.
b) They stimulate platelet production.
c) They regulate hemostasis.
d) They stimulate the proliferation and differentiation of progenitor cells.
28. Which bones are primarily responsible for blood cell production in adults?
a) All bones equally contribute to blood cell production.
b) Long bones in the lower limbs.
c) Chest, skull base, spinal vertebrae, and upper limb portions.
d) Skull and facial bones.
29. Which type of white blood cell is characterized by bilobed nuclei and acidic-staining granules?
a) Basophils
b) Neutrophils
c) Eosinophils
d) Monocytes
30. What is the significance of pluripotent hematopoietic stem cells in blood cell production?
a) They give rise to platelets exclusively.
b) They differentiate into lymphocytes only.
c) They ensure the continuous renewal of blood cell population.
d) They are responsible for blood clotting.