The fetal period of prenatal development is characterized by

Question

The fetal period of prenatal development is characterized by

BlackTom AI · Accepted Answer

The question asks about the fetal period of prenatal development and what characterizes it.
Option 1: 'the refinement of organs and body systems so they become functional.' This is accurate because the fetal period (roughly from week 9 to birth) is focused on growth, maturation, and functional refinement of already formed organs and systems, preparing the fetus for life outside the womb.
Option 2: 'a lack of movement.' Movement does occur during development, and while movement patterns evolve, a blanket statement about a lack of movement during the fetal period is misleading and incorrect; fetuses exhibit activity that increases as development progresses.
Option 3: 'the initial establishment of all the organs.' The initial formation and establishment of organs occur mainly during the embryonic period, not the fetal period. By the time the fetal period begins, major organs are already in place and the focus shifts to maturation.
Option 4: 'implantation of the organism in the uterine wall.' Implantation is an early event that marks the transition from zygote to embryo and occurs before the embryonic period, so it is not a feature of the fetal period.
In summary, the statement that best fits the fetal period is the one describing refinement and functional maturation of organs and body systems, while the other options describe events from earlier developmental stages or inaccurately describe fetal period characteristics.

The fetal period of prenatal development is characterized by单项选择题

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