2nd STUDY GUIDE
Units 1, 2, 3 — HIGH-YIELD REVIEW
IMMUNE SYSTEM & BLOOD CONCEPTS
T Cells vs. B Cells (VERY TESTED)
Shared Facts
● Both are lymphocytes
● Both originate in bone marrow
T Cells (Cell-Mediated Immunity)
Think: “T = Thymus, Touches cells”
● Mature in thymus
● Do NOT produce antibodies
● Destroy infected or abnormal cells directly
Types
, ● Helper T Cells (CD4+)
○ Activate and coordinate immune response
● Cytotoxic T Cells (CD8+)
○ Kill infected or cancer cells
B Cells (Humoral Immunity)
Think: “B = Bone marrow, Binds antibodies”
● Mature in bone marrow
● Produce antibodies (immunoglobulins)
● Some become memory cells → long-term immunity
Active vs. Passive Immunity (NCLEX CLASSIC)
Active Immunity
● Body makes its own antibodies
● Has memory
● Long-lasting
Types
● Natural active → infection
Units 1, 2, 3 — HIGH-YIELD REVIEW
IMMUNE SYSTEM & BLOOD CONCEPTS
T Cells vs. B Cells (VERY TESTED)
Shared Facts
● Both are lymphocytes
● Both originate in bone marrow
T Cells (Cell-Mediated Immunity)
Think: “T = Thymus, Touches cells”
● Mature in thymus
● Do NOT produce antibodies
● Destroy infected or abnormal cells directly
Types
, ● Helper T Cells (CD4+)
○ Activate and coordinate immune response
● Cytotoxic T Cells (CD8+)
○ Kill infected or cancer cells
B Cells (Humoral Immunity)
Think: “B = Bone marrow, Binds antibodies”
● Mature in bone marrow
● Produce antibodies (immunoglobulins)
● Some become memory cells → long-term immunity
Active vs. Passive Immunity (NCLEX CLASSIC)
Active Immunity
● Body makes its own antibodies
● Has memory
● Long-lasting
Types
● Natural active → infection
