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Prenatal Development and Placenta Function

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Prenatal Development and Placenta Function

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Questions and Answers

Which substances require active transport across the placenta?

O2 and CO2

Lipid-soluble substances and pathogens

Amino acids and iron (correct)

Hormones and proteins

During which weeks does the placenta take over the endocrine function from the corpus luteum?

Weeks 21-30

Weeks 31-38

Weeks 9-12

Weeks 12-17 (correct)

What is the primary function of relaxin during pregnancy?

Producing thyroid hormone

Inhibiting contractions

Loosening the pelvis and dilating the cervix (correct)

Stimulating fetal development

What is the result of increased thyrotropin during pregnancy?

Increased appetite and hot flashes Signup and view all the answers

During which weeks does the fetus begin to produce surfactant in the lungs?

Weeks 16-20 Signup and view all the answers

What is the primary function of hCG during pregnancy?

Stimulating male gonads to produce testosterone Signup and view all the answers

What is the result of the fusion of the nuclei of a sperm and an oocyte?

A new cell considered a zygote Signup and view all the answers

What is the main function of the corona radiata and zona pellucida?

To block fertilization Signup and view all the answers

What is the process by which the sperm penetrates the corona radiata and zona pellucida?

Acrosomal reaction Signup and view all the answers

What is the result of the depolarization of the plasma membrane after fertilization?

The prevention of more sperm penetration Signup and view all the answers

What is the term for the period of development from fertilization to the end of week 2?

Pre-embryonic stage Signup and view all the answers

What is the purpose of the yolk sac?

To provide nourishment to the embryo Signup and view all the answers

What is the result of the formation of the primitive streak?

The formation of the endoderm and mesoderm Signup and view all the answers

What is the term for the process by which the embryo implants in the uterine wall?

Implantation Signup and view all the answers

What is the purpose of the placenta in embryonic development?

To provide oxygen and nutrients to the embryo Signup and view all the answers

What is the term for the stage of development from week 3 to week 8?

Embryonic stage Signup and view all the answers