Fertilization Process: From Sperm to Zygote

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What is the primary mechanism by which oxygen and carbon dioxide cross the placenta?

Facilitated diffusion

Active transport

Simple diffusion (correct)

Osmosis

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

Weeks 12-17 (correct)

Weeks 6-10

Weeks 18-22

Weeks 24-28

What is the function of relaxin during fetal development?

Loosens the pelvis and dilates the cervix (correct)

Stimulates fetal growth and development

Stimulates the production of thyroid hormone

Inhibits uterine contractions

What is the primary function of progesterone during fetal development?

Inhibits uterine contractions Signup and view all the answers

When does the production of surfactant by the lungs begin?

Weeks 16-20 Signup and view all the answers

What is the primary function of hCG during fetal development?

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

What is the term for the process by which a sperm fuses with an oocyte to form a zygote?

Fertilization Signup and view all the answers

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

To facilitate sperm penetration Signup and view all the answers

What is the term for the release of enzymes by the sperm to penetrate the corona radiata and zona pellucida?

Acrosomal reaction Signup and view all the answers

What percentage of blastocysts fail to implant in the uterus?

50%-75% Signup and view all the answers

What is the function of human chorionic gonadotropin (hCG)?

To maintain the corpus luteum Signup and view all the answers

What is the term for the outer layer of cells that surrounds the embryo?

Chorion Signup and view all the answers

What is the purpose of the yolk sac?

To produce blood cells and germ cells Signup and view all the answers

What is the term for the process by which the embryo develops into a three-layered disc?

Gastrulation Signup and view all the answers

What is the term for the indentation that forms in the primitive streak?

Neural groove Signup and view all the answers

What is the function of the placenta?

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