Which Period of Prenatal Development Is Considered the Critical Period

question 218

Multiple Choice

Which period of prenatal development is considered the critical period and also a time in which teratogens can have a profound effect that endure into adulthood?

• A) Conception
• B) Germinal period
• C) Embryonic period
• D) Foetal period

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Definitions:

Primitive Streak

The primitive streak is a structure that forms on the surface of the early embryonic disc, marking the beginning of gastrulation and establishing body axes.

Embryonic Disc

A flat plate of cells in early embryonic development that will form the embryo.

Capacitation

A physiological process that sperm must undergo within the female reproductive tract before they can successfully fertilize an egg.

Sperm

The male reproductive cell or gamete, capable of fertilizing the female ovum to produce offspring.