When Konrad Lorenz released his groups of geese together, what was the outcome? The geese that saw Lorenz immediately after hatching ignored their biological mother .
During which stage of prenatal development does breathing movement begin quizlet?
Around 18 weeks, fetal movement can be felt. 19 weeks, the fetus can hear. 27 weeks , breathing movements begin in preparation for breathing outside womb.
What stage of prenatal development begins with conception 2 points quizlet?
1st stage of prenatal developmental. Time: 2 weeks. Begins at conception when the sperm and egg cells fuse in a fallopian tube. The fertilized egg (single-celled zygote) moves to the uterus.
What stage of prenatal development are nearly all basic organs formed?
The period of prenatal development from about the third week through the eighth is the embryonic period , characterized by the development of the basic forms of all structures of the body, including internal organs.
What stage of prenatal development begins with conception quizlet?
The embryonic period (also called the embryonic stage) is the stage of prenatal development from approximately the third through the eighth week after conception, during which the basic forms of all body structures, including internal organs, develop.
What are the 3 stages of conception?
The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period , and the time from the ninth week until birth is known as the fetal period.
What stage of prenatal development does breathing begin?
*Around 18 weeks, fetal movement can be felt. *Around 19 weeks, the fetus can hear. * Around 27 weeks , breathing movements begin in preparation for breathing outside the womb.
Which stage of prenatal development is the longest 2 points?
The longest period of prenatal development is the fetal period which begins at the 9th week after conception and lasts until birth.
Which stage of prenatal development is the shortest 2 points?
Figure 23.2. 2: The germinal stage of human development begins with fertilization in a Fallopian tube and ends with implantation in the uterus. The germinal stage of development is the first and shortest of the stages of the human lifespan. The main events in this stage of development are illustrated in Figure 23.2.
During which stage of prenatal development are nearly all basic organs formed 2 points?
The embryonic stage lasts from the end of the germinal stage to two months after conception. The developing ball of cells is now called an embryo. In this stage, all the major organs form, and the embryo becomes very fragile.
What is the most critical period of prenatal development?
In general, major defects of the body and internal organs are more likely to occur between 3 to 12 embryo / fetal weeks . This is the same as 5 to 14 gestational weeks (weeks since the first day of your last period). This is also referred to as the first trimester.
How long does the germinal stage last?
The germinal period ( about 14 days in length ) lasts from conception to implantation of the zygote (fertilized egg) in the lining of the uterus.
Why is the embryonic period the most critical?
The embryonic period is the most critical period of development because of the formation of internal and external structures . The critical periods of development for the organs are also discussed in the section on specific organ development.
At what stage does the umbilical cord develop?
The umbilical cord is the vital connection between the fetus and the placenta. Umbilical cord development begins in the embryologic period around week 3 with the formation of the connecting stalk.
Which organ develops and is fully functional in the first trimester quizlet?
The heart and circulatory system begin to develop.
What actions supports healthy fetal development and prevents harm to the fetus?
To prevent harm to a fetus, you can quit smoking and drinking before the pregnancy to get a higher chance of a healthy baby. You can also improve your diet by eating less red meat, increasing your fiber intake, and reduce soda intake.
