Fertilization Process: From Sperm to Zygote

Play an AI-generated podcast conversation about this lesson

During weeks 14-16 of fetal development, which substances can cross the placenta through simple diffusion?

Antibiotics and pathogens

Amino acids and iron

O2, CO2, and other gases (correct)

Lipid-soluble fetotoxic substances

When does sexual differentiation typically begin?

Weeks 31-34

Weeks 9-12 (correct)

Weeks 21-24

Weeks 14-16

What happens to the blood in the heart during weeks 9-12?

It flows through the foramen ovale and ductus arteriosus (correct)

It flows through the pulmonary artery

It flows through the superior vena cava

It flows through the aorta

During weeks 13-16, what can be observed in the fetus?

Movements becoming more powerful and sebaceous glands coating the skin with vernix caseosa Signup and view all the answers

What is the effect of estrogen on the mother during pregnancy?

It helps fetal development and stimulates maternal tissue growth Signup and view all the answers

Which hormone stimulates the growth of mammary glands?

Prolactin Signup and view all the answers

What is the result of the fusion of sperm and oocyte nuclei during fertilization?

A cell with half genetic material from each parent Signup and view all the answers

What is the primary function of the acrosomal reaction during fertilization?

To release enzymes to penetrate the corona radiata and zona pellucida Signup and view all the answers

What is the term for the first two weeks of development after fertilization?

Pre-embryonic stage Signup and view all the answers

What is the primary function of the placenta during embryonic development?

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

What is the term for the indentation that forms during week 3 of embryogenesis, allowing cells to travel along and form endoderm or mesoderm?

Primitive streak Signup and view all the answers

What is the result of the fusion of maternal and embryonic tissues during placenta development?

A functional placenta Signup and view all the answers

What is the term for the fluid-filled sac that surrounds the embryo and provides protection?

Amnion Signup and view all the answers

What is the percentage of blastocysts that fail to implant in the uterine wall?

50%-75% Signup and view all the answers

What is the term for the type of twins that form when a single fertilized egg splits in two?

Identical twins Signup and view all the answers

When is the placenta fully developed and functional?

By the end of week 12 Signup and view all the answers

Fertilization Process: From Sperm to Zygote

Podcast Beta

Questions and Answers