Which of the following components plays the most active role in invading the endometrium during blastocyst implantation?

syncytiotrophoblast

epiblast

hypoblast

extraembryonic somatic mesoderm

extraembryonic visceral mesoderm

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Between which two layers is the extraembryonic mesoderm located?

exocoelomic membrane and cytotrophoblast

syncytiotrophoblast and cytotrophoblast

syncytiotrophoblast and endometrium

exocoelomic membrane and syncytiotrophoblast

epiblast and hypoblast

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During the second week of development, the embryoblast receives its nutrients via

diffusion

osmosis

reverse osmosis

fetal capillaries

yolk sac nourishment

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Which germ layers are present at the end of week 3 of development (day 21)?

ectoderm, mesoderm, and endoderm

epiblast and hypoblast

ectoderm and endoderm

epiblast only

epiblast, mesoderm, and hypoblast

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Which process establishes the three definitive germ layers?

gastrulation

neurulation

craniocaudal folding

lateral folding

angiogenesis

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The first indication of gastrulation in the embryo is

formation of the primitive streak

formation of the notochord

formation of the neural tube

formation of extraembryonic mesoderm

formation of tertiary chorionic villi

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Somites may differentiate into all of the following EXCEPT

epidermis of skin

cartilage

muscle

bone

dermis of skin

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Intermediate mesoderm will give rise to the

kidneys and gonads

heart

neural tube

somites

notochord

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The developing embryo has a distinct human appearance by the end of

week 8

week 5

week 6

week 7

week 4

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The lateral mesoderm is divided into two distinct layers by the formation of the

intraembrionic coelom

extraembrionic coelom

cardiogenic region

notochord

yolk sac

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In pregnant woman on the second day after a fertilization as a result of cleavage had apostates of light and dark blastomeres. What possible result of such variant of cleavage will be?

A birth of monozygotic twins

The arrest of an embryogenesis

A birth of the boy

A birth of Siamese twins

A birth of the girl

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In embryo coated with a fertilization membrane, synthesis of lytic enzymes of a trophoblast genetical inhibited. What process of an embryogenesis can be late failed?

Implantation

Gastrulation

Delamination

Epiboly

Immigration

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On microslide of human embryo taken at a consensual abortion, it is detected primitive groove in which two layers of cells range: ectoderm and endoderm. At what stage of embryonic development there was an embryo?

Gastrulations

Neurulations

Organofaction

A progenesis

A histogenesis

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As a result of blocking separate ingredients of a genome, a cell gain characteristic for them

Morphological, biochemical and function singularities. What title has this process?

Differentiation

Capacitation

Reception

Adhesion

Determination

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Breaking architectonics in a somite region near to an endoderm and notochord is found during biopsy examination of embryonic material. Disorders of what tissues or organs will be?

Skeletal tissues

Striated skeletal muscle

Urogenital system

Striated cardiac muscle

Fibrillar connective tissue of a skin

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Breaking of differentiation of an endoderm is detected in embryonic material. Modification of development of what organ can arise at the given process?

Stomach

Hearts

Kidney

Aorta

Salivary gland

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The gastrulation or formation of germinal layers of an embryo descends different ways. What is the way of human ectoderm and endoderm formation?

Delamination

An invagination

Immigration

Invagination and epiboly

Epiboly

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During a gastrulation the embryos passes from histotrophic to hematrophic type of a feeding. What fetal membrane for the first time ensures it?

A chorion

Yolk sack

Amnion

A trophoblast

Allantois

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