NFDN 2004 Units 1 & 2 2025/2026 Exam
Questions Marking Scheme New Update
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Fetal Development - 🧠 ANSWER ✔✔Pre-embryonic stage : AKA the germinal
phase 1st 2 weeks after conception
Begins with Fertilization which takes place in the ampulla of the fallopian tube.
Then cleavage (mitosis) occurs : zygote is transported to the uterine cavity by tubal
muscular movements
Morula : after 4 cleavages, 16 cells result. The morula reaches the uterine cavity
approx 72 hours after fertilization. Fluid from uterine cavity produces nutrients,
enters the morula, the blastocyst is formed
Blastocysts : the morula enters uterine cavity and is fed nutrients in which turns
into a blastocyst
Trophoblast : outer ring of cells of blastocyst, this forms the placenta and
membranes
Implantation : implantation occurs 7-10 days after conception in the endometrium
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435.
TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 1
,Embryonic Stage : end of 2nd week through 8th week
Basic major body organs and main external features
Fetal Stage : end of the 8th week - birth
Conception - 🧠 ANSWER ✔✔In an hour the ovum is released from ovary and
passes into the fallopian tube where it travels down to the sperm
In about 5 hours one spermatozoon enters the ovum's thick outer membrane and
pregnancy begins
In 40 weeks (9 months) after fertilization, the fetus fully matures and is born
Implantation (7-8 days)
Implantation - 🧠 ANSWER ✔✔The zygote is moved toward the uterus and
implants about 6-8 days after ovulation, which forms into about 100 cells and is
now called a blastocyst
Trophoblast attaches to the endometrium for nourishment
The process of attachment and placental formation is called implantation
Blastocyst secretes human chorionic gonadotropin (hCG) - a human stimulates the
corpus luteum to produce progesterone to maintain pregnancy
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435.
TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 2
, Embryonic Layers - 🧠 ANSWER ✔✔Ectoderm : forms the central nervous system,
special senses, skin and glands
Mesoderm: forms skeletal, urinary, circulatory and reproductive organs
Endoderm : forms respiratory system, liver, pancreas, and digestive system
Embryonic membrane : uterus/fundus, amnion (amniotic fluid), chorion, umbilical
cord, placenta, uterine fundus
Embryonic Stage - 🧠 ANSWER ✔✔Begins at 15th day after conception and
continues through week 8, all the cells are known now as an embryo
Complex organs and features currently
Most critical time for organ development and main external systems
Amniotic Fluid - 🧠 ANSWER ✔✔surround the embryo
2 sources from maternal blood to fetal urine
Helps maintain fetus body temp, permits symmetric growth and development,
cushion the fetus from trauma, allow umbilical cord to be relatively free from
compression
98% water and 2% organic matter
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435.
TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 3
Questions Marking Scheme New Update
| A+ Rated
Fetal Development - 🧠 ANSWER ✔✔Pre-embryonic stage : AKA the germinal
phase 1st 2 weeks after conception
Begins with Fertilization which takes place in the ampulla of the fallopian tube.
Then cleavage (mitosis) occurs : zygote is transported to the uterine cavity by tubal
muscular movements
Morula : after 4 cleavages, 16 cells result. The morula reaches the uterine cavity
approx 72 hours after fertilization. Fluid from uterine cavity produces nutrients,
enters the morula, the blastocyst is formed
Blastocysts : the morula enters uterine cavity and is fed nutrients in which turns
into a blastocyst
Trophoblast : outer ring of cells of blastocyst, this forms the placenta and
membranes
Implantation : implantation occurs 7-10 days after conception in the endometrium
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435.
TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 1
,Embryonic Stage : end of 2nd week through 8th week
Basic major body organs and main external features
Fetal Stage : end of the 8th week - birth
Conception - 🧠 ANSWER ✔✔In an hour the ovum is released from ovary and
passes into the fallopian tube where it travels down to the sperm
In about 5 hours one spermatozoon enters the ovum's thick outer membrane and
pregnancy begins
In 40 weeks (9 months) after fertilization, the fetus fully matures and is born
Implantation (7-8 days)
Implantation - 🧠 ANSWER ✔✔The zygote is moved toward the uterus and
implants about 6-8 days after ovulation, which forms into about 100 cells and is
now called a blastocyst
Trophoblast attaches to the endometrium for nourishment
The process of attachment and placental formation is called implantation
Blastocyst secretes human chorionic gonadotropin (hCG) - a human stimulates the
corpus luteum to produce progesterone to maintain pregnancy
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435.
TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 2
, Embryonic Layers - 🧠 ANSWER ✔✔Ectoderm : forms the central nervous system,
special senses, skin and glands
Mesoderm: forms skeletal, urinary, circulatory and reproductive organs
Endoderm : forms respiratory system, liver, pancreas, and digestive system
Embryonic membrane : uterus/fundus, amnion (amniotic fluid), chorion, umbilical
cord, placenta, uterine fundus
Embryonic Stage - 🧠 ANSWER ✔✔Begins at 15th day after conception and
continues through week 8, all the cells are known now as an embryo
Complex organs and features currently
Most critical time for organ development and main external systems
Amniotic Fluid - 🧠 ANSWER ✔✔surround the embryo
2 sources from maternal blood to fetal urine
Helps maintain fetus body temp, permits symmetric growth and development,
cushion the fetus from trauma, allow umbilical cord to be relatively free from
compression
98% water and 2% organic matter
COPYRIGHT©NINJANERD 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435.
TERMS OF USE. PRIVACY STATEMENT. ALL RIGHTS RESERVED 3
