The helper cell
A) stimulates immune response.
B) prevent or lessen certain diseases.
C) destroys disease causing cells.
D) regulates the immune system.
Correct Answer:
Verified
Q19: Lymph cells, or lymphocytes, produce specialized proteins
Q20: Disease-causing agents are known as _.
A) macrophages
B)
Q21: Vaccination produces what type of immunity?
A) Natural
B)
Q22: The two types of acquired active immunity
Q23: Which of these are proteins produced by
Q25: Which of the following are true of
Q26: Thymosin distributes _.
A) B cells
B) T cells
C)
Q27: Antitoxins are types of _.
A) antigens
B) antibodies
C)
Q28: This system transports lymph from the tissues
Q29: The HIV virus is transmitted by _.
A)
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