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Biology: Fertilization Process

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Questions and Answers

Which substances cross the placenta through simple diffusion?

Lipid soluble fetotoxic substances

O2, CO2, etc. (correct)

Antibiotics and pathogens

Amino acids and iron

When does sexual differentiation begin?

Weeks 21-24

Weeks 9-12 (correct)

Weeks 14-16

Weeks 17-20

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

It is shifted through the foramen ovale and the ductus arteriosus (correct)

It is pumped directly to the liver

It is pumped to the arms and legs

It is sent directly to the lungs

What is the primary function of relaxin?

To loosen the pelvis and dilate the cervix Signup and view all the answers

What is the effect of estrogen on the mother's body?

It stimulates maternal tissue growth Signup and view all the answers

What is the primary function of hCG?

To stimulate male gonads to produce testosterone 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 the mother and half from the father Signup and view all the answers

What happens to millions of sperm during fertilization?

They are killed due to acidity Signup and view all the answers

What happens to the surviving sperm during fertilization?

They travel to the tubes in 30-120 minutes Signup and view all the answers

What is the function of the acrosomal reaction during fertilization?

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

What happens after fertilization to prevent more sperm from penetrating?

The plasma membrane depolarizes Signup and view all the answers

What is the result of meiosis completion after fertilization?

The ejection of a polar body and the formation of an ovum Signup and view all the answers

What is the gestation time for full fetal development?

From fertilization to birth Signup and view all the answers

What is the purpose of the yolk sac during embryonic development?

To provide nourishment until the placenta is functional Signup and view all the answers

What is the result of embryonic folding during week 3 of embryonic development?

A flat sheet of cells becomes cylindrical Signup and view all the answers

When is the placenta complete?

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