Question 1

Which of the following leukocytes is primarily responsible for phagocytizing bacteria and is typically the first to arrive at the site of infection?

Accepted Answer

Neutrophil

Question 2

A patient presents with an elevated eosinophil count. Which of the following conditions is most likely associated with this finding?

Accepted Answer

Parasitic infection

Question 3

Which leukocyte releases histamine and heparin, contributing to inflammation and anticoagulation?

Accepted Answer

Basophil

Question 4

What is the process called when leukocytes squeeze between endothelial cells to exit the bloodstream and enter tissues?

Accepted Answer

Diapedesis

Question 5

Which cell type is responsible for antigen presentation and stimulating lymphocytes during chronic infections?

Accepted Answer

Monocyte

Question 6

A blood smear shows a leukocyte with a large, round nucleus and very little cytoplasm. Which cell is this most likely to be?

Accepted Answer

Lymphocyte

Question 7

Which of the following best describes the function of T cells?

Accepted Answer

Cellular immunity

Question 8

Which process describes the attraction of leukocytes to chemical signals at the site of infection?

Accepted Answer

Chemotaxis

Question 9

A patient with a low white blood cell count is said to have which condition?

Accepted Answer

Leukopenia

Question 10

Which of the following is a correct sequence of events for leukocyte migration from the bloodstream to the site of infection?

Accepted Answer

Margination → Diapedesis → Chemotaxis

Question 11

Which leukocyte is most likely to be elevated in a patient with allergic asthma?

Accepted Answer

Eosinophil

Question 12

Which of the following best describes the function of histaminase produced by eosinophils?

Accepted Answer

Breaks down histamine to decrease inflammation

Question 13

Which cell lineage gives rise to both monocytes and granulocytes during leukopoiesis?

Accepted Answer

Myeloid line

Question 14

A differential white blood cell count is most useful for which of the following?

Accepted Answer

Identifying the proportion of each type of leukocyte

Question 15

Which of the following best describes the role of cell adhesion molecules (CAMs) in leukocyte function?

Accepted Answer

Facilitate margination by allowing leukocytes to stick to endothelial cells

Question 16

Which leukocyte is responsible for immunological surveillance and destruction of abnormal cells?

Accepted Answer

Natural Killer (NK) cell

Question 17

Which of the following is a function of monocytes after they leave the bloodstream?

Accepted Answer

Become macrophages and phagocytize pathogens

Question 18

Which of the following best describes the respiratory burst in neutrophils?

Accepted Answer

Production of hydrogen peroxide to kill pathogens

Question 19

A patient with a chronic infection is most likely to have an elevated count of which leukocyte?

Accepted Answer

Monocyte

Question 20

Which of the following best describes the difference between granulocytes and agranulocytes?

Accepted Answer

Granulocytes have visible cytoplasmic granules; agranulocytes do not

Leukocytes: Structure, Function, and Classification

Study Guide - Practice Questions