After Encountering an Antigen,an Animal Has Memory Cells That Can

question 46

Multiple Choice

After encountering an antigen,an animal has memory cells that can produce antibodies quickly.In the absence of the antigen

• A)memory cells die off.
• B)memory cells don't produce antibodies at all.
• C)memory cells produce few antibodies.
• D)memory cells are totally inactivated.

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Definitions:

Amnion

Prenatal life-support system that is a bag or envelope containing a clear fluid in which the developing embryo floats.

Placenta

A life-support system that consists of a disk-shaped group of tissues in which small blood vessels from the mother and offspring intertwine.

Stimulant

A substance that raises levels of physiological or nervous activity in the body.

Infant's Heart Rate

The number of heartbeats per minute in a baby, which can vary widely depending on factors such as age, activity level, and health status.