number 4

• The structure is the neck of the sperm/spermatozoon, which is located between the head and middle piece

• The structure is the neck of the sperm/spermatozoon, which is rich in mitochondria.

• The structure is the neck of the sperm/spermatozoon, which is rich in proteolytic enzymes.

• The structure is the neck of the spermatid, which is located between the head and middle piece

• The structure is the neck of the spermatid, which is located between the head and tail

• The structure is the middle piece of the sperm/spermatozoon, which is located between the neck and tail.

• The structure is the middle piece of the sperm/spermatozoon, which does not contain mitochondria.

• The structure is the middle piece of the sperm/spermatozoon, which contains proteolytic enzymes for the fertilazation.

• The structure is the middle piece of spermatid, which is rich in mitochondria.

• The structure is the middle piece of the spermatid, which is located between the head and tail. the notochord.

Choose the three correct statements!

• Only the capacitated sperm cell is able to pass through the corona radiata

• The acrosome reaction allows sperm to penetrate the zona pellucida

• The acrosome reaction results in the release of enzymes

• The acrosome reaction occurs in the testis

• The acrosome reaction occurs in the cavity of uterus

Choose the only correct statement!

• The acrosome reaction results in release of acrosin and trypsin-like substance from the sperm cell

• cell The acrosome reaction results in release of acrosin and trypsin-like substance from the zona pellucida

• The acrosome reaction results in release of trypsin-like substance from the oocyte

• The acrosome reaction results in release of acrosin from the oocyte

• The acrosome reaction results in release of cortical granules from the polar bodies

Which of the following processes prevents the polyspermy? One correct answer.

• As a result of release of lysosomal enzymes from the cortical granules of oocyte, the oocyte membrane becomes impermeable to other sperm cells.

• As soon as the sperm cell has entered the oocyte, it starts to produce proteolytic enzymes.

• As soon as the sperm cell has entered the oocyte, the zona pellucida begins to secrete acrosin.

• As a result of zona reaction, the oocyte begins to secrete acrosin.

• As a result of zona reaction, the oocyte and sperm cell begin to secrete acrosin.

Choose the four correct statements

• The syncytiotrophoblast release proteolytic enzymes which help the implantation.

• Lacunae of syncytiotrophoblast contain maternal blood.

• The syncytiotrophoblast contributes to the formation of placenta

• The syncytiotrophoblast is the outermost layer of the late blastocyst

• The syncytiotrophoblast is the innermost layer of the late blastocyst

Choose the three correct statements!

• The outer layer of the blastocyst is the trophoblast, which gives rise to the cytotrophoblast and syncytiotrophoblast layers.

• The syncytiotrophoblast is the outer, multinucleated part of the blastocyst.

• The cytotrophoblast is the inner, mononuclear part of the blastocyst.

• The syncytiotrophoblast is the inner, multinucleated part of the blastocyst.

• The cytotrophoblast is the outer, mononuclear part of the blastocyst.

Choose the two correct statements!

• During the formation of morula, two groups of cells are formed: the inner one of the two groups of cells is called embryoblast cells.

• During the formation of morula, two groups of cells are formed: the outer one of the two groups of cells is called trophoblast cells.

• The developing blastocyst is surrounded by the extraembryonic mesoderm.

• The cavity of blastocyst is the blastocoel, which contains amniotic fluid

• The cavity of blastocyst is the blastocel, which is filled with fetal blood

. Choose the only correct statement!

• During cleavage, the zygote divides with mitosis, and the subsequent mitoses results in the formation of morula and than the blastocyst.

• During cleavage, the zygote divides with meiois, and the subsequent meioses results in the formation of morula and than the blastocyst

• During cleavage, the secondary oocyte divides with mitosis, and the subsequent mitoses results in the formation of morula and than the blastocyst

• During cleavage, the zygote divides with mitosis, and the subsequent mitoses results in the formation of two polar bodies

• During cleavage, the secondary oocyte divides with mitosis, and the subsequent mitoses results in the formation of definitive oocyte and one polar body

Choose the four correct statements!

• The extraembryonic coelom is bordered by the extraembryonic somatic and splanchnic mesoderm

• The extraembryonic coelom is found in the early extraembryonic mesoderm

• The amniotic cavity is bordered by the epiblast layer and amnioblasts.

• The chorionic cavity is located outer to the primitive yolk sac and the amniotic cavity

• The primitive yolk sac is bordered by the epiblast layer and the exocoelomic (Heuser) membrane