Презентация на тему 7-week-old human embryo

7-week-old human embryo Human Development It is difficult to imagine that each of us began life as a single cell about Fertilization Process of a sperm cell joining with an egg cell – zygote. Each normally has CleavageA succession of rapid cell divisions that follow fertilization.The embryo does not enlarge during this period Cleavage (divide via mitosis) forms the 2 cell stage They split again to form the 4 cell stage And again to form the 8 cell stage… And eventually form a Morula MorulaContinued cleavage produces a solid ball of cells known as morula.16-64 cells. Next it becomes a blastula Blastula (hollow ball)A fluid filled cavity called blastocoel forms within the morula creating a hollow ball And next, a gastrula GastrulaGastrulation – is a rearrangement of the cells of the blastula.Result of gastrulation is that some The Regents Diagram…Sperm and ovumZygote (fertilized ovum)2-cell stage4-cell stageMorulaBlastulaGastrula Early Development The fertilized egg is called a zygote.By the third day, the embryo, called a By the fifth day, the morula has developed into a blastocyst.The blastocyst attaches to the wall Extraembryonic Membranes Four extraembryonic membranes form. These membranes are the amnion, the chorion, the yolk sac, The Placenta Provides food and oxygen and removes wastesThe placenta has two surfacesA fetal side that As an embryo develops, the chorionic villi begin to grow into the uterine wall.Nutrients, oxygen, and Three Trimesters of Development Human development takes around 266 days from fertilization to birth.This period known The First TrimesterAll tissues, organs, and organ systems begin to develop. For the first 8 weeks The Second TrimesterPeriod of growthThe Third TrimesterThe fetus continues to grow at a rapid rate.Fat accumulates BirthBirth occurs in three stages: dilation, expulsion, and the placental stage.The beginning of the birthing process InfancyThe first two years of lifeChildhood and AdolescenceChildhood is the period of growth and development that Adulthood At the end of adolescence, physical growth is complete, marking the beginning of adulthood.Decrease in

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7-week-old human embryo


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Human Development



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as a single cell about the size of the dot at the end of this


It is difficult to imagine that each of us began life as a single cell about the size of the dot at the end of this sentence.


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– zygote. Each normally has 23 chromosomes.Fertilization restores 46 chromosomes.

Fertilization

Process of a sperm cell joining with an egg cell – zygote.

Each normally has 23 chromosomes.

Fertilization restores 46 chromosomes.


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not enlarge during this period of development.Cleavage simply partitions the cytoplasm of one large cell

Cleavage

A succession of rapid cell divisions that follow fertilization.
The embryo does not enlarge during this period of development.
Cleavage simply partitions the cytoplasm of one large cell (the zygote) into many small cells called blastomeres.


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Cleavage (divide via mitosis) forms the 2 cell stage


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They split again to form the 4 cell stage



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And again to form the 8 cell stage…



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And eventually form a Morula



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cells.

Morula

Continued cleavage produces a solid ball of cells known as morula.
16-64 cells.


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Next it becomes a blastula



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morula creating a hollow ball called the blastula.

Blastula (hollow ball)

A fluid filled cavity called blastocoel forms within the morula creating a hollow ball called the blastula.


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And next, a gastrula



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of gastrulation is that some of the cells of blastula move to an interior location,

Gastrula

Gastrulation – is a rearrangement of the cells of the blastula.
Result of gastrulation is that some of the cells of blastula move to an interior location, and three cells layers are established – invagination.
The three–layered embryo is called the gastrula.


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The Regents Diagram…



Sperm and ovum
Zygote (fertilized ovum)
2-cell stage
4-cell stage
Morula
Blastula
Gastrula




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day, the embryo, called a morula, leaves the oviduct and enters the uterus.

Early Development

The fertilized egg is called a zygote.

By the third day, the embryo, called a morula, leaves the oviduct and enters the uterus.


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blastocyst attaches to the wall of uterus around the sixth day and is fully implanted

By the fifth day, the morula has developed into a blastocyst.

The blastocyst attaches to the wall of uterus around the sixth day and is fully implanted by Day 10.


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the chorion, the yolk sac, and the allantois.

Extraembryonic Membranes

Four extraembryonic membranes form.

These membranes are the amnion, the chorion, the yolk sac, and the allantois.


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two surfacesA fetal side that forms from the chorionA maternal side that forms from uterine

The Placenta

Provides food and oxygen and removes wastes

The placenta has two surfaces

A fetal side that forms from the chorion

A maternal side that forms from uterine tissue


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the uterine wall.Nutrients, oxygen, and wastes diffuse across maternal and fetal blood vessels.The placenta contains

As an embryo develops, the chorionic villi begin to grow into the uterine wall.

Nutrients, oxygen, and wastes diffuse across maternal and fetal blood vessels.

The placenta contains tissue from both mother and fetus.


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fertilization to birth.This period known as gestation, or pregnancy.The pregnancy is divided into three trimesters.

Three Trimesters of Development

Human development takes around 266 days from fertilization to birth.
This period known as gestation, or pregnancy.
The pregnancy is divided into three trimesters.


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For the first 8 weeks of pregnancy, the developing human is called an embryo.At the

The First Trimester

All tissues, organs, and organ systems begin to develop.
For the first 8 weeks of pregnancy, the developing human is called an embryo.
At the end of eight weeks, the embryo is called a fetus.
By the end of the fourth week the heart begins to beat.
During the second month arms and legs take shape.



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at a rapid rate.Fat accumulates under the skin to provide insulation for the fetus once

The Second Trimester

Period of growth

The Third Trimester

The fetus continues to grow at a rapid rate.

Fat accumulates under the skin to provide insulation for the fetus once it is born.

The Second Trimester

Period of growth

The Third Trimester

The fetus continues to grow at a rapid rate.

Fat accumulates under the skin to provide insulation for the fetus once it is born.


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beginning of the birthing process is called labor.

Birth

Birth occurs in three stages: dilation, expulsion, and the placental stage.

The beginning of the birthing process is called labor.


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of growth and development that extends from infancy to adolescence.Begins between ages 8 to 13

Infancy

The first two years of life

Childhood and Adolescence

Childhood is the period of growth and development that extends from infancy to adolescence.

Begins between ages 8 to 13 in girls and ages 10 to 15 in boys.

Puberty marks the beginning of adolescence.


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the beginning of adulthood.Decrease in muscle mass, a slowing of overall metabolism, and a decreased

Adulthood

At the end of adolescence, physical growth is complete, marking the beginning of adulthood.

Decrease in muscle mass, a slowing of overall metabolism, and a decreased pumping ability of the heart.



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