Which of the following stages of development has the highest nuclear to cytoplasmic ratio?
a. zygote
b. morula
c. blastula
d. ovum
What is blastula?
100
Which extra-embryonic membrane contributes to the formation of the placenta?
What is the chorion?
100
This is the process wherein the embryo is divided into two symmetrical halves?
What is neurulation?
100
Nutrients are carried from the placenta to the fetus by this part of the umbilical cord.
What is the umbilical vein?
200
This is when, in a female, is meiosis II completed.
What is at fertilization?
200
Which of the following is in the correct chronological order?
a. zygote, morula, blastocyst
b. zygote, blastocyst, morula
c. blastocyst, morula, zygote
d. morula, zygote, blastocyst
What is zygote, morula, blastocyst?
200
The notochord develops from this germ layer.
What is the mesoderm?
200
This germ layer gives rise to cells that will eventually form the brain and pigments of the skin and hair.
What is ectoderm?
200
This is the shunt that connects the two atria of the hear.
What is the foramen ovale?
300
The ovulated oocyte is surrounded by an outer capsule called this.:
a. acrosome
b. the corona radiata
c. morula
d. follicle
What is the corona radiata?
300
The embryo implants in the uterus in this stage of development.
What is blastocyst (blastula)?
300
Which extraembryonic membrane contributes to the formation of the umbilical cord?
What is the allantois?
300
This germ layer produces cells that will become the kidney tubules and cardiovascular system.
What is mesoderm?
300
This shunt connects the pulmonary trunk with the aorta.
What is the ductus arteriosus?
400
Monospermy is assured by the release of this ion in the ovum.
What is calcium (Ca2+)
400
As a result of cleavage following fertilization, a solid ball of cells is formed. This stage of development is referred to as this.
What is a morula (Latin for mulberry)?
400
The neural tube and neural crest cells develop form this germ layer.
What is the ectoderm?
400
This germ layer produces cells that line the respiratory tract and urinary bladder.
What is the endoderm?
400
This fetal shunt bypasses the liver.
What is the ductus venosus?
500
An ovum can be fertilized up to 24 hours after fertilization. Sperm can survive up to 48 hours in the female reproductive tract.
Intercourse during approximately how many days of each menstrual cycle can result in conception?
What is approximately 3 days?
500
Which part of a blastocyst develops into the embryonic disc?
What is the inner cell mass?
500
After successful implantation has occurred, the corpus luteum is maintained by a hormone that is secreted by the trophoblast cells. This hormone is called.
This hormone is detected in pregnancy tests and is a likely cause of morning sickness.
What is human chorionic gonadotropin?
500
Of the three germ layers, which layer forms last?
What is the mesoderm?
500
This is organ that provides the fetus with a means to acquire nutrients and eliminate wastes.