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Fertilization Process: From Sperm to Zygote

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22 Questions

What is the primary function of the foramen ovale and ductus arterioles in the infant's heart?

To close after birth

What is the main component of colostrum that provides immunity to the infant?

Immunoglobulins

What is the term for the expression of a gene's effect on an organism's physical appearance?

Phenotype

What is the term for an individual who carries a recessive allele that can be passed on to their offspring?

Carrier

What is the process by which the uterus returns to its pre-pregnancy size after birth?

Involution

What is the primary function of brown fat in the infant?

Regulation of body temperature

What happens to the majority of sperm during fertilization?

They are killed due to acidity and blocked by cervical mucus

What is the process called when the sperm releases enzymes to penetrate the corona radiata and zona pellucida?

Acrosomal reaction

What is the layer that surrounds the embryo and is filled with fluid for protection?

Amnion

What is the term for the zygote and associated membranes moving to the uterus?

Conceptus

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

50%-75%

What is the term for the primitive excertory duct that will become part of the urinary bladder?

Alantois

What is the process called when the cells of the embryonic disc become three layers?

Embryogenesis

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

To provide nourishment to the embryo until the placenta is functional

What is the term for the indentation in the embryonic disc where new cells travel to form endoderm or mesoderm?

Primitive streak

When is the placenta fully developed and functional?

By the end of week 12

What substances cross the placenta through active transport?

Amino acids and iron

When does sexual differentiation begin?

Weeks 9-12

What is the purpose of relaxin during fetal development?

To loosen the pelvis and dilate the cervix

Why is progesterone important during fetal development?

To inhibit contractions

What is the normal caloric intake for a pregnant woman during the 1st trimester?

Normal caloric intake

What is the purpose of oxytocin during childbirth?

To intensify contractions

Learn about the process of fertilization, where a sperm and an oocyte combine to form a new cell called a zygote. Discover how millions of sperm are eliminated due to acidity and cervical mucus, and how the surviving sperm reach the fallopian tubes. Understand the journey of fertilization and how a new life begins.

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