During a Primary Response to Antigen Exposure,all of the Following

question 19

Multiple Choice

During a primary response to antigen exposure,all of the following occur except

• A)the antigen must activate appropriate B cells.
• B)B cells may take time to develop into plasma cells and memory cells.
• C)antibody levels do not peak until 1 to 2 weeks after the initial exposure.
• D)neutrophils invade the surrounding areas,releasing chemotactic substances.
• E)the first immunoglobulins to appear in circulation are of the IgM type.

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Definitions:

Implantation

The stage in the early development of mammals where the embryo attaches to the wall of the uterus.

Foetal Stage

The stage of development in human gestation that occurs from the ninth week after fertilization until the birth of the child.

Embryonic Stage

A critical period in prenatal development covering the first 8 weeks after fertilization, when the basic structures of the organism begin to form.

Post-Natal Stage

The period following childbirth, focusing on the mother's recovery and the baby's adaptation to life outside the womb.