What are the 3 stages of prenatal development

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 of cell division and initial differentiation (cell maturation), (2) the embryonic period, or period of organogenesis, which lasts …


What is the correct order of prenatal development periods?

There are three stages of prenatal development: germinal, embryonic, and fetal. Let’s take a look at what happens to the developing baby in each of these stages.

What are 3 environmental factors that affect prenatal development?

Environmental influences ranging from radioactivity and stress in the outside world to drugs, chemicals, hormones, and viruses in the mother’s bloodstream can affect prenatal development. Such threats affect the health of the fetus in several ways.

What are the three periods of prenatal development quizlet?

11.1 Outline the major events of the three stages of prenatal development. 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 4 stages of embryonic development?

  • 1.1 Fertilization.
  • 1.2 Cleavage.
  • 1.3 Blastulation.
  • 1.4 Implantation.
  • 1.5 Embryonic disc.

What are the 5 stages of conception?

  • Conception: From Egg to Embryo. …
  • Ovulation. …
  • Moving Into the Fallopian Tube. …
  • The Sperm’s Long Journey. …
  • Fertilization: Sperm Penetrates Egg. …
  • The Cells Start to Divide. …
  • Implantation. …
  • Pregnancy Hormones.

What are the 5 stages of prenatal development?

  • Germinal stage. Conception occurs when the female egg (ovum) is fertilized by a the male sperm. …
  • Embryonic stage. The embryonic stage begins after implantation and lasts until eight weeks after conception. …
  • Fetal stage. …
  • Congenital abnormalities. …
  • Maternal derived abnormalities. …
  • Prematurity. …
  • BOOKS. …

What are the 3 stages of pregnancy quizlet?

This period is generally divided into three stages: the germinal stage, the embryonic stage, and the fetal stage. fails, as is quite common, the pregnancy terminates.

What are the developmental stages?

There are three broad stages of development: early childhood, middle childhood, and adolescence.

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.

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What are the stages of fetal development quizlet?

  • Pre-embryonic stage. the first stage of pregnancy. …
  • Embryonic Stage. the second stage of pregnancy. …
  • Fetal stage. the third stage of pregnancy. …
  • Week 12. • Your baby is about 3 inches long and weighs 25 grams. …
  • Week 20. • …
  • Week 24-26. • …
  • Week 34-36. • …
  • Week 38-40. •

What affects the prenatal process?

Prenatal development is highly influenced by the inheritance, expression, and regulation of genes.

What factors affect prenatal development?

Prenatal risk factors include chronic maternal illness, certain maternal infections, toxin exposures and nutritional deficiencies. Risk factors in the perinatal period include pregnancy-related complications, prematurity and low birth weight, and infection exposure during pregnancy or at time of birth.

What are 4 environmental factors that can harm a fetus?

These chemicals include commonly known hazards such as lead, mercury, and environmental tobacco smoke, as well as some pesticides, solvents, products containing chlorine, and other chemicals referred to as “persistent organic pollutants.” The fetus is particularly vulnerable to environmental chemicals that can disrupt …

What are the stages of blastocyst formation?

The processes of formation are called gastrulation, neurulation, and organogenesis. Formed by the cleavage of zygote. Formed from the inner cell mass of the blastocyst.

What is the embryonic period?

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.

What is the first stage in embryonic development?

In the first stages of embryonic development, a single-celled zygote undergoes many rapid cell divisions, called cleavage, to form a blastula, which looks similar to a ball of cells. Next, the cells in a blastula-stage embryo start rearranging themselves into layers in a process called gastrulation.

What is the most important stage of prenatal development?

Embryonic Period This stage lasts from implantation until about 8 weeks from the time of conception (or the 10th week of pregnancy). This is the most important time of prenatal development because the embryo is developing the foundations for a healthy baby.

Which of the following developmental periods is the shortest?

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

What are the four stages of fertilization?

The stages of fertilization can be divided into four processes: 1) sperm preparation, 2) sperm-egg recognition and binding, 3) sperm-egg fusion and 4) fusion of sperm and egg pronuclei and activation of the zygote.

Which of the following sequences represents the correct order of events in the formation of a human fetus?

Fertilization – cleavage – gastrulation – differentiation.

What is the first stage in the first trimester?

First trimester: key stages The first trimester begins on the first day of your last period and lasts until the end of week 12. This means that by the time you know for sure you’re pregnant, you might already be five or six weeks pregnant! A lot happens during these first three months.

What is Stage 3 of the four stages of writing development that children go through from 18 months to three years?

Answer: The stage 3 of the four stages of writing development that children go through from 18 months to three years is Pictures of objects and people interspersed with writing marks. Hence answer is 4. Pictures of objects and people interspersed with writing marks.

What is the correct order of Piaget's stages of development?

The correct sequence is letter D. sensorimotor, pre-operational, concrete operational, formal operational.

What is the correct order of human development from the first stage to the last )?

In these lessons, students become familiar with the four key periods of growth and human development: infancy (birth to 2 years old), early childhood (3 to 8 years old), middle childhood (9 to 11 years old), and adolescence (12 to 18 years old).

During which stage of development does the zygote form and divide quizlet?

During the germinal stage, the first— and shortest—stage of the prenatal period, the zygote begins to divide and grow in complex- ity. The fertilized egg (now called a blastocyst) travels toward the uterus, where it becomes implanted in the uterus’s wall, which is rich in nutrients.

What occurs in the germinal stage quizlet?

What happens during the germinal period of development? The protective structures of the fetus start to form and provide nourishment from the mother, and the zygote turns into an embryo.

When does the fetal stage of prenatal development occur quizlet?

The last stage of prenatal development is the fetal stage, which lasts from two months after conception until birth. About one month into this stage, the sex organs of the fetus begin to form.

What is the human prenatal stage made up of quizlet?

The prenatal stage includes three periods, or trimesters, of pregnancy, and ends with birth, about 9 months after conception.

How many trimesters are in a human gestation period quizlet?

A “normal,” full-term pregnancy is 40 weeks and can range from 37 to 42 weeks. It’s divided into three trimesters. Each trimester lasts between 12 and 14 weeks, or about 3 months.

What month is the fetus 14 16 inches long?

EIGHTH MONTH Fetus is 14-16 inches long. Fetus weighs 2 1/2-3 pounds. Fetus may react to noises with a jerking action. Fetus has moved to head-down position.