Question: Which Of The Following Stages Of Development Begins At Conception And Lasts For Two Weeks?

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.

What stage does conception begin at 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 are the stages of prenatal development?

There are three stages of prenatal development: germinal, embryonic, and fetal.

Which stage of prenatal development is the longest?

In the fetal stage, the developing human organism is called a fetus. This is the longest stage, starting in the ninth week after conception and continuing until birth.

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What are the 3 major 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 is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.

What are 4 environmental factors that can harm a fetus?

Environmental factors which have been implicated in adverse pregnancy outcome include smoking, video display terminals, anesthetic gases, antineoplastic drugs and exposure to lead, selenium and inorganic mercury.

During which week of pregnancy do ears and eyes form?

Eight weeks into your pregnancy, or six weeks after conception, your baby’s lower limb buds take on the shape of paddles. Fingers have begun to form. Small swellings outlining the future shell-shaped parts of your baby’s ears develop and the eyes become obvious.

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.

At what stage of pregnancy do all organs form quizlet?

By week 8, all organs systems have formed and the embryo is now called a fetus.

What are 3 environmental factors that affect prenatal development?

Other teratogens that affect prenatal development include radiation, pollution, and infectious disease. Radiation increases the risk of childhood cancer, as well as emotional and behavioral disorders; because of this, it is recommended that pregnant women avoid x-rays unless absolutely necessary.

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What are the 7 stages of development?

There are seven stages a human moves through during his or her life span. These stages include infancy, early childhood, middle childhood, adolescence, early adulthood, middle adulthood and old age.

How do I know if my baby is developing normally in the womb?

An ultrasound is usually done for all pregnant women at 20 weeks. During this ultrasound, the doctor will make sure that the placenta is healthy and attached normally and that your baby is growing properly. You can see the baby’s heartbeat and movement of its body, arms, and legs on the ultrasound.

What is the shortest stage of prenatal development?

The germinal stage of development is the first and shortest of the stages of the human lifespan.

How many zygotes do not survive the first two weeks?

As many as 50 percent of zygotes do not survive the first two weeks. During the period of the fetus, the most rapid prenatal changes take place.

What is the fetus the size of by month four quizlet?

During the fourth month, second trimester, a typical fetus is: 3 inches long.

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