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What path does sperm take after entering the female's vagina?

The sperm swims along the uterus and fallopian tubes toward the egg.

Fertilization [受精 - shòu jīng]

The process where many sperm surround the egg, but only one sperm successfully combines with the egg to form a fertilized egg, uniting genetic material from both parents into a single, new cell.

How does an egg prevent multiple sperm from entering once one penetrates?

A rapid chemical reaction occurs where the egg instantly creates a hardened defensive barrier that locks out all other surrounding sperm.

How many chromosomes does the future embryo receive from each parent?

The embryo receives exactly $23$ chromosomes from the mother and $23$ chromosomes from the father.

Cleavage & Transport (Step ③)

The phase where the fertilized egg moves along the fallopian tube toward the uterus while undergoing multiple rounds of cell division and gradually developing.

Implantation [着床 - zhuó chuáng]

The process occurring after entering the uterus where the fertilized egg attaches to the uterine wall, securing the developing cells to the mother's body and beginning pregnancy.

Embryo [胚胎 - pēi tāi]

The developing cluster of cells formed as the fertilized egg continues to divide and develop after implantation.

Placenta [胎盘 - tāi pán]

A structure that gradually forms to act as a life-support system providing oxygen and nutrients for the developing embryo.

Critical Thinking Box (激励思维): What occurs if both ovaries discharge an egg at the same time?

If both discharged eggs are successfully fertilized by two separate sperm, it results in fraternal (dizygotic) twins.

Notes for Teachers (给老师的话): Typical timeline for cell division and travel to the uterine wall

The process of cell division and travel to the uterine wall typically takes $6$ to $7$ days.

Notes for Teachers (给老师的话): Pedagogical guidance for educators

Teachers are advised to guide students on how to protect and cherish their bodies while instilling healthy concepts of sexuality.

How many sperm enter initially versus how many reach the egg?

Out of roughly $200$ to $300$ million sperm that enter, only a few dozen to a few hundred actually reach the egg in the fallopian tube.

What happens to the hundreds of millions of sperm that fail to reach the egg?

They simply die off and are naturally absorbed or cleared out by the female body.

Acidic Barrier

A hostile obstacle where the natural acidity of the vagina immediately neutralizes millions of sperm.

The Cervical Gate

An obstacle where the cervix acts as a filter, trapping weak or abnormally shaped sperm in thick mucus.

Immune System Attack against sperm

A response where the female body's white blood cells mistake entering sperm for foreign invaders and destroy them.

"The Wrong Turn" in the sperm journey

An obstacle where sperm swim up the empty fallopian tube that does not contain a released egg and run out of energy.

Fate of the runner-up sperm surrounding the egg

Once the single winning sperm penetrates the egg and seals the defensive barrier, the remaining sperm run out of energy, break down within a few days, and vanish.

What do the multiplying "dots" inside the circles represent in Steps ③ and ④?

They represent new cells multiplying through cell division, splitting from $1$ cell into $2$, then $4$, $8$, $16$, and so forth.

Zygote

The single initial cell formed the exact moment the single sperm fuses with the egg.

Cellular composition of the embryo upon reaching the uterus

By the time the cluster reaches the uterus (Step ④), it has developed into a hollow ball made of roughly $100$ tightly packed cells.

Cell Specialization

The biological process where multiplying cells receive chemical instructions to stop looking identical and take on specific jobs (e.g., heart, brain, bone, skin, or placental cells).

How many cells make up a baby by the time it is born?

The original combined cell multiplies into roughly $26$ billion cells.

Development duration for organs, limbs, and tissues

Specialized cells group together to construct organs, limbs, tissues, and beating hearts over the course of $9$ months.

Genetic blueprint of the single combined cell

The single cell contains the entire genetic blueprint—functioning like a highly detailed recipe book—needed to build a complete human body.