What is the embryonic stage in psychology?
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Embryonic Stage The beginning of the third week after conception marks the start of the embryonic period, a time when the mass of cells becomes distinct as a human. The embryonic stage plays an important role in the development of the brain.
What happens during the embryonic stage of development quizlet psychology?
What happens during the embryonic period? Rapid growth and intensive cell differentiation, the organs and major systems of the body form, the genes on the sex chromosomes and hormonal influences also trigger the initial development of the sex organs.
What happens during the embryonic stage?
During the embryonic stage, the heart begins to beat and organs form and begin to function. At 22 days after conception, the neural tube forms along the back of the embryo, developing into the spinal cord and brain.
What happens during the fetal stage quizlet?
During the fetal period, the rate of growth slows as the infant prepares for birth. the trophoblast, which gives rise to the embryonic part of the placenta. what three factors influence the effects of teratogens?
What happens to the brain during the fetal period of development?
The fetal brain begins to develop during the third week of gestation. Neural progenitor cells begin to divide and differentiate into neurons and glia, the two cell types that form the basis of the nervous system. By the ninth week, the brain appears as a small, smooth structure.
What are the characteristics of the embryonic stage?
The embryonic period of development is the stage in which most organs are formed. Organs begin to form, and the embryo elongates and starts to assume a human-like shape. The heart and main blood vessels are formed, and the heart starts beating by the 6th week.
Which of the following occurs during the embryonic stage quizlet?
Which of the following occurs during the embryonic stage of development? Nose, eyes, and ear become noticeable.
What major changes occur during the fetal stage of development quizlet?
What is the time frame for the fetus and what are the major changes that occur during fetal development? The fetal stage begins at the end of the 8th week of prenatal development and lasts until birth. Growth is rapid, and body proportions change considerably.