What are the stages of prenatal development?
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 are known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
What happens during the fetal period of development?
This final stage of development is called the fetal period of development. This stage takes place from the end of the embryonic period until the time of birth (or the 10th to 40th weeks of pregnancy). The most notable development during this stage is the dramatic change in size that takes place.
How long does it take for a baby to develop during pregnancy?
Prenatal development takes about 38 weeks, during which a single cell becomes a full-term baby. Prenatal development is divided into three different categories of development. The first 2 weeks of development is the germinal period. The germinal period begins with conception and ends when the blastocyst is fully implanted into uterine tissue.
What is the germinal stage of pregnancy?
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. The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes.
Which of the three stages is the longest?
Stage 1: Labor begins Labor begins during the first stage. It's usually the longest stage, and it's divided into three phases: early labor, active labor, and transition.
What stage of prenatal development is the longest?
the fetal periodThe 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 quizlet?
Terms in this set (3)germinal stage. the first-and shortest-stage of the prenatal period, which takes place during the first 2 weeks following conception.embryonic stage. the period from 2-8 weeks following fertilization during which significant growth occurs in the major organs and body systems.fetal stage.
What is the first and shortest stage of the prenatal period called quizlet?
The Germinal Stage: Fertilization to 2 Weeks. During the germinal stage, the first— and shortest—stage of the prenatal period, the zygote begins to divide and grow in complex- ity.
Which stage of prenatal development is the longest quizlet?
What is the longest stage of prenatal development? The fetal stage.
What are the 3 stages of prenatal development?
Normal prenatal development lasts about 38 weeks and is divided into three stages: germinal, embryonic, and fetal. During these three stages of gestation, the original single-celled zygote develops into an embryo and then fetus [1, 2].
What is the name of the first and shortest stage of prenatal development which takes place during the first two weeks following conception?
the germinal stageThe 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.
Which stage of prenatal development is the longest 2 points?
the fetal stageThe longest stage of prenatal development is the fetal stage that lasts from the ninth week until birth spanning the last two trimesters.
What are the four stages of prenatal development quizlet?
Prenatal development proceeds through the germinal (first 2 weeks), embryonic (2 weeks to 2 months), and fetal stages (2 months to birth) as the zygote is differentiated into a human organism.
What are the 3 stages of prenatal development quizlet?
This period is generally divided into three stages: the germinal stage, the embryonic stage, and the fetal stage.
Which prenatal period lasts the longest?
The fetal stage is the longest of the three stages of prenatal development. It goes from the ninth week after conception to the birth of the baby. This period is approximately thirty weeks long.
How long is each of the three stages of pregnancy quizlet?
The stages of development during pregnancy is divided into trimesters. There are three trimesters during pregnancy with three months each trimester adding up to a total of 9 months.
Which stage of prenatal development is the longest 2 points?
the fetal stageThe longest stage of prenatal development is the fetal stage that lasts from the ninth week until birth spanning the last two trimesters.
How long is the embryonic stage?
After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of pregnancy. During this stage, the baby is called an embryo.
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. During the first week after conception, the zygote divides and multiplies, going from a one-cell structure to two cells, then four cells, then eight cells, and so on.
How long is the fetal stage?
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 is the first two weeks of prenatal development?
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 is the fetal stage?
Fetal Stage. Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus. The fetal period of prenatal develop marks more important changes in the brain. This period of development begins during the ninth week and lasts until birth.
What is the germinal stage of a sperm?
The germinal stage begins at conception when the sperm and egg cell unite in one of the two fallopian tubes. The fertilized egg is called a zygote. Just a few hours after conception, the single-celled zygote begins making a journey down the fallopian tube to the uterus.
How much does an embryo weigh?
By the eighth week of development, the embryo has all of the basic organs and parts except those of the sex organs. At this point, the embryo weighs just one gram and is about one inch in length. By the end of the embryonic period, the basic structures of the brain and central nervous system have been established.
Why is the prenatal period important?
While you might think of child development as something that begins during infancy, the prenatal period is also considered an important part of the developmental process. Prenatal development is a time of remarkable change that helps set the stage for future psychological development. The brain develops over the course of the prenatal period, but it will continue to go through more changes during the early years of childhood
What is going on in the brain during the second trimester?
So what's going on inside the brain during this important period of prenatal development? The brain and central nervous system also become more responsive during the second trimester. Around 28 weeks, the brain starts to mature faster, with an activity that greatly resembles that of a sleeping newborn.
When does the brain develop?
The embryonic stage plays an important role in the development of the brain. Approximately four weeks after conception, the neural tube forms.
What is prenatal development?
Prenatal development, also called antenatal development, in humans, the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth (or parturition ). human fetus; prenatal development. An ultrasound image of a human fetus. age fotostock/SuperStock.
What is the process of embryonic development?
The machinery is essential for four processes: cell proliferation, cell specialization, cell interaction, and cell movement.
What is the female pronucleus of a ripe egg?
Following the separation of the second polar body (one or two polar bodies are produced during division), the oocyte nucleus typically reconstitutes and is then called the female pronucleus of the ripe egg. It is now ready to unite with its male counterpart and thereby consummate the total events of fertilization.
What is the term for a cell that tries to penetrate an egg to fertilize it?
A sperm cell attempting to penetrate an egg (ovum) to fertilize it.
What is the mitotic spindle?
During mitosis (ordinary cell proliferation by division), the centromeres attach to a bundle of microtubules known as the mitotic spindle, which is formed by centrioles (cylindrical cell structures).
How many chromosomes are in each pronucleus?
Each resolves its diffuse chromatin material into a complete single set of 23 chromosomes. Each chromosome is composed of two chromatids held together by a centromere.
How does the human body develop?
The human body, like that of most animals, develops from a single cell produced by the union of a male and a female gamete (or sex cell). This union marks the beginning of the prenatal period, which in humans encompasses three distinct stages: (1) the pre-embryonic stage, the first two weeks of development, which is a period ...
How long does the fetal period last?
The embryonic period begins with the implantation of the blastocyst in the uterine wall, and it lasts for six weeks. During the fetal period, the rate of growth slows as the infant prepares for birth. false.
How much does the size of a fetus increase during the fetal period?
As the time for birth approaches, the fetus's rate of growth does slow down, but during the entire fetal period, the size of the fetus increases by up to twentyfold.
How many weeks pregnant is Martha?
Martha, who is 28 weeks pregnant, has realized that her fetus moves and kicks in response to her singing. This is an example of the _____ communication between mother and child.
What is high alpha fetoprotein?
High levels of alpha-fetoprotein are an indicator of neural tube defects.
Why do newborns spend so much time in REM sleep?
Current research suggests that the reason that newborns spend a high proportion of time in REM sleep as compared to the time spent in non-REM sleep is that: REM sleep, or active sleep, provides needed patterns of stimulation for proper visual development.
Which period of the brain experiences the most growth and maturity?
Terms in this set (54) The development period when the brain experiences the most growth and maturity is the: fetal period. The connections between neurons—where chemical signals from one cell's axon travel to another cell's dendrite or body—are at the synapses. true.
When does the actual delivery of a child occur?
The actual delivery of the child occurs at the end of the second stage of labor.
How long is an embryo at 8 weeks?
At 8 weeks, the embryo is 1 inch long.
When is the first ultrasound performed for a fetus?
Can be performed as early as week 5. Access to the fetal circulation may be obtained through the instrument, and direct visualization of the embryo permits the diagnosis of malformations.
What are the stages of prenatal development?
This time period is divided into different categories of development. The 3 primary stages of prenatal development are the germinal period, the embryonic period, and the fetal period. Each of these stages is important for reaching the ultimate goal of a healthy baby.
Why is prenatal development important?
This is the most important time of prenatal development because the embryo is developing the foundations for a healthy baby. The blastocyst that implanted in the uterus continues to divide rapidly after implantation. Through a process called differentiation, cells begin to take on different functions.
What is the Brochure of Development?
Brochure includes information about the development through the germinal, embryonic and fetal periods
What is the term for the zygote that is implanted into the uterus?
Once it reaches the uterus, the zygote becomes what is called a blastocyst , and it begins to implant into the wall of the uterus. The germinal period ends when the blastocyst is fully implanted into uterine tissue.
How long is the germinal period?
Prenatal development is divided into three different categories of development. The first 2 weeks of development is the germinal period. The germinal period begins with conception and ends when the blastocyst is fully implanted into uterine tissue.
When does the germinal period end?
The germinal period begins with conception and ends when the blastocyst is fully implanted into uterine tissue. Next, the embryonic period lasts from implantation until about 8 weeks from the time of conception. This is the most crucial period of prenatal development.
How much does a baby weigh at 38 weeks?
By the time the baby is considered full term at 38 weeks, it will probably be over 20 inches long and weigh about 7 1/2 pounds.