Multiple Choice
Exposure to a vaccine that stimulates a primary immune response leads to which type of immunity?
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41. Immune System
Immune System
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Which cells aid in the body's defense processes by secreting histamine and heparin?
A
Neutrophils
B
Cytotoxic T cells
C
B lymphocytes
D
Mast cells
Verified step by step guidance1
Step 1: Begin by understanding the role of mast cells in the immune system. Mast cells are a type of white blood cell that play a key role in the body's defense mechanisms, particularly in allergic reactions and inflammation.
Step 2: Learn about the substances secreted by mast cells. Mast cells release histamine, which contributes to inflammation and allergic responses by increasing blood flow and permeability of blood vessels. They also secrete heparin, an anticoagulant that prevents blood clotting.
Step 3: Compare mast cells to other immune cells listed in the options. Neutrophils are phagocytic cells that engulf and destroy pathogens, cytotoxic T cells target and kill infected or cancerous cells, and B lymphocytes produce antibodies. None of these cells secrete histamine and heparin.
Step 4: Recognize that mast cells are uniquely specialized for secreting histamine and heparin, which makes them the correct answer to the question.
Step 5: Conclude that mast cells are essential for initiating inflammatory responses and aiding in the body's defense processes, distinguishing them from other immune cells listed in the options.
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