Reproduction and Pregnancy

Six parts following one cell to a baby. It opens on the uterus, a muscular organ that spends most of its life small and can expand several hundredfold, then the ovary, which holds every egg a body will ever have from before birth. The third part zooms into a single follicle to see one egg matured and released, and the fourth follows its journey down the tube — where fertilisation happens, which is not where the pregnancy settles. The fifth is the placenta, an organ grown for one purpose and discarded afterwards, where two circulations come close enough to trade without ever mixing. The last shows the fetus in place, and how a body makes room for it.

52 min to complete
Beginner level
6 Parts

CodePLU Goal

Upgrading Human Mental Models

Learn how to think in Workflows

The organ where a baby grows, and the tubes and ovaries beside it
Beginner 8 min Part 1

What Are the Parts of the Uterus?

The uterus is the pear-shaped organ where a baby grows. Label its fundus, body, cervix, the fallopian tubes and the ovaries in an interactive playground.

Inside the small organ that ripens one egg at a time
Beginner 9 min Part 2

What Does an Ovary Do Each Month?

An ovary is a small organ that holds a lifetime supply of eggs and ripens one of them roughly every month. Label the resting follicles, a growing follicle, the mature follicle, the moment of release, and what is left behind, in an interactive playground.

The tiny sac that feeds, protects and finally releases one egg
Beginner 8 min Part 3

What Is an Ovarian Follicle?

Every egg inside an ovary sits in its own little sac called a follicle. Label the egg cell, the wall of cells around it, the fluid that opens up inside, and the shapes a follicle takes as it grows and empties, in an interactive playground.

From the ovary, along the tube, to the lining of the uterus
Beginner 9 min Part 4

The Journey of an Egg

About once a month an ovary releases an egg that travels down the fallopian tube toward the uterus. Label the ovary, follicle, tube, egg and uterus lining in an interactive playground.

The temporary organ that feeds a baby — and why where it sits matters
Beginner 9 min Part 5

What Does the Placenta Do?

The placenta is an organ grown just for pregnancy. It swaps food and oxygen between mother and baby through the umbilical cord, and normally sits high on the uterus wall, well clear of the way out. Label the placenta, cord, uterus wall, fluid and cervix in an interactive playground.

Head down, curled up, and already pointing at the way out
Beginner 9 min Part 6

How Does a Baby Lie Before Birth?

In the last weeks of pregnancy most babies settle head-down in the uterus, curled up in a pool of warm fluid with the exit directly below. Label the placenta, the fluid, the baby's head, the uterus wall, the cervix and the birth canal in an interactive playground.