,1- Regarding tissues, state the correct one:
a. Epithelial tissues derive from the ectoderm.
b. The mesoderm gives rise to the skin.
c. The endoderm gives rise to the nervous system.
d. The ectoderm gives rise to liver tissue.
2- Several events occur at the end of the first trimester. One of them is incorrect:
a. The uterus is 56 mm and weighs 14 grams.
b. The genitals are visible.
c. The notochord is replaced by the vertebral column.
d. The heart begins to beat.
e. At this stage, the embryo is already called a fetus.
3- It is correct to say that the embryo's heart begins to beat spontaneously at:
a. 24 to 25 days
b. The third month of gestation
c. Two months
d. At 45 days of gestation
4- In the human embryo, gastrulation begins during the:
a. Second and third week of gestation
b. Seventh day of gestation
c. 45 days of gestation
d. After the first month
5- The corpus luteum of the ovary releases progesterone until the placenta has sufficient
secretion to maintain the pregnancy. This occurs during pregnancy at approximately:
a. First month
b. Third month
c. Up to the seventh month
6- The hormone that signals the corpus luteum of pregnancy that pregnancy has begun is:
a. Progesterone
b. Oxytocin
c. Estrogens
d. Human chorionic gonadotropin
7- The umbilical cord contains:
a. 2 veins and 1 umbilical artery
b. 2 arteries and 2 veins
c. Two arteries and 1 umbilical vein
d. An artery and a vein
8- Implantation of the blastocyst in the endometrium occurs approximately:
, a. 3 days after fertilization
b. 7 days after fertilization
c. 24 hours after fertilization
d. 28 days of the menstrual cycle
9- One of these options is incorrect regarding the placenta:
a. It is an exchange organ that provides nutrients and gases to the embryo
b. It secretes estrogen and progesterone
c. It is formed exclusively from maternal tissue
d. It develops from the chorion and the endometrium
10-. The chorion and amnion of the embryo originate from the:
a. Trophoblast
b. Placenta
c. Endometrium
d. Ectoderm
11. The neurohypophysis produces all of the following except:
a. Prolactin
b ADH
c Vasopressin
d. Oxytocin
12- The trophoblast is a region of the cell responsible for:
a. Forming the morula
c. A stage of the embryo with 92 cells
b. Incorporating into the maternal endometrium
d. Forming the blastocoel
13- Gastrulation is a process that produces:
c.Three embryonic germ layers
a.64-cell embryos
d.The trophoblast
d.Implantation of the blastula
14. Mass of blastomeres of 32 cells
a. Morula
b. Blastula
c. Gastrula
d. Blastocoel
15. Regarding the options presented, identify the correct option:
a. If two sperm enter an egg, fraternal twins will be conceived.
b. If two eggs are each fertilized by one sperm, identical twins will be formed.
a. Epithelial tissues derive from the ectoderm.
b. The mesoderm gives rise to the skin.
c. The endoderm gives rise to the nervous system.
d. The ectoderm gives rise to liver tissue.
2- Several events occur at the end of the first trimester. One of them is incorrect:
a. The uterus is 56 mm and weighs 14 grams.
b. The genitals are visible.
c. The notochord is replaced by the vertebral column.
d. The heart begins to beat.
e. At this stage, the embryo is already called a fetus.
3- It is correct to say that the embryo's heart begins to beat spontaneously at:
a. 24 to 25 days
b. The third month of gestation
c. Two months
d. At 45 days of gestation
4- In the human embryo, gastrulation begins during the:
a. Second and third week of gestation
b. Seventh day of gestation
c. 45 days of gestation
d. After the first month
5- The corpus luteum of the ovary releases progesterone until the placenta has sufficient
secretion to maintain the pregnancy. This occurs during pregnancy at approximately:
a. First month
b. Third month
c. Up to the seventh month
6- The hormone that signals the corpus luteum of pregnancy that pregnancy has begun is:
a. Progesterone
b. Oxytocin
c. Estrogens
d. Human chorionic gonadotropin
7- The umbilical cord contains:
a. 2 veins and 1 umbilical artery
b. 2 arteries and 2 veins
c. Two arteries and 1 umbilical vein
d. An artery and a vein
8- Implantation of the blastocyst in the endometrium occurs approximately:
, a. 3 days after fertilization
b. 7 days after fertilization
c. 24 hours after fertilization
d. 28 days of the menstrual cycle
9- One of these options is incorrect regarding the placenta:
a. It is an exchange organ that provides nutrients and gases to the embryo
b. It secretes estrogen and progesterone
c. It is formed exclusively from maternal tissue
d. It develops from the chorion and the endometrium
10-. The chorion and amnion of the embryo originate from the:
a. Trophoblast
b. Placenta
c. Endometrium
d. Ectoderm
11. The neurohypophysis produces all of the following except:
a. Prolactin
b ADH
c Vasopressin
d. Oxytocin
12- The trophoblast is a region of the cell responsible for:
a. Forming the morula
c. A stage of the embryo with 92 cells
b. Incorporating into the maternal endometrium
d. Forming the blastocoel
13- Gastrulation is a process that produces:
c.Three embryonic germ layers
a.64-cell embryos
d.The trophoblast
d.Implantation of the blastula
14. Mass of blastomeres of 32 cells
a. Morula
b. Blastula
c. Gastrula
d. Blastocoel
15. Regarding the options presented, identify the correct option:
a. If two sperm enter an egg, fraternal twins will be conceived.
b. If two eggs are each fertilized by one sperm, identical twins will be formed.
