Fertilization ability of the spermatozoon is preserved for 24 - 30 hours.
Two veins and one artery are present in the umbilical cord of the newborn body.
The yolk sack (sacculus vitellinus) takes part in the formation of the embryo discus.
Amnion is not involved in the formation of the embryo discus.
The cells obtained as a result of segmentation are called blastomers.
The trophoblast related structures are associated with the implantation and nutrition of the embryo.
The smooth chorion (chorion laeve) takes part in the formation of the fetal sack.
The embryoblast cells situated on the floor of the amnion differentiate into the ectoderma.
The chorion frondosum participates in the formation of placenta.
Linea primitiva (the primitive line) is a temporary structures related to the organization of the mesoderma.
The sperm volume is normally is:
2 - 6 ml
6 - 8 ml
8 - 10 ml
10 - 12 ml
The II type oocyte has a fertilization ability during:
12 - 24 hours
24 - 36 hours
36 - 72 hours
The spermatozoa number in 1cm3 sperm is:
10 - 30 x10(6) / cm3
400 - 500 x10(2) / cm3
40 - 120 x10(6) / cm3
130 - 160 x10(6) / cm3
The minimum part of mobiles spermatozoa in the sperm necessary for fertilization is above:
The process of transformation of spermatids into spermatozoa is called:
The trophoblast is part of:
The consecutive stages in the embryogenesis are:
Morulla - Blastocyta - Organogenesis - Gastrulation
Morulla - Blastocyta - Gastrulation - Organogenesis
Blastocyta - Morulla - Gastrulation - Organogenesis
Organogenesis - Morulla - Gastrulation - Blastocyta
The somites derive from:
The dermatomes form:
Skin connective tissue
The segmentation by human embryo is:
The formation of many small holes in the acrosome
Penetration of spermatozoon through corona radiata of the oocyte
Penetration of spermatozoon through zona pellucida of the oocyte
Series of mitosis in the zygote during its movement through the oviduct.
Which element is not included in the placental barrier:
Capillaries of the placental villae
Capillaries of the uterus wall
The implantation starts:
On the first day after the fertilization
6-7 days after the fertilization
10 days after the fertilization
15 days after the fertilization
The fertilization is completed in:
What type of function is the oocyte cortical reaction
The umbilical cord of the newborn baby consists of:
Two arteries and two veins
Two arteries and one vein
Two veins and one artery
One artery and one vein
Which of the following is typical for monozygotic twins:
They don't look alike
They look alike
They can be of a different gender
They are always the same gender
There are no differences in their immunological characteristics
The somites (epimer of the mesoblast) form:
From the mesenchyme derivates:
Cardiac muscle tissue
Smooth muscle tissue
Skeletal muscle tissue
From the ectoblast derivates:
Skin epithelium (epidermis)
Epithelium of the oral cavity
The fetal sack wall consists of:
Smooth chorion (chorion laeve)
Covering decidua (decidua capsularis)
The placental barrier after the third month of embryogenesis consists of:
Epithelium of the placental capillaries
Mesenchyme of the placental villa
Epithelium of the uterus capillaries
The maternal part of the placenta consists of:
Loose connective tissue slips (septae)
The fetal part of the placenta consists of:
Loose connective tissue clips (septae)
Which of the following are specific for the acrosomal reaction:
Releasing of the acrosomal enzymes
Facilities the penetration of spermatozoon through zona pellucida of the oocyte
Type of endocytosis
Completed after the spermatozoon receptor binding to zona pellucida
Completed after the fertilization
Which of the following are specific for the cortical reaction is:
Completed in corona radiata
Associated with releasing of the acrosomal enzymes
Associated with releasing of the proteolytic enzymes under the oocyte plasmalemma
Associated with destroying of the spermatozoon receptor in zona pellucida
Blocks the passing of more than one spermatozoon into the oocyte.