Distinguish egg production from oviduct transport
Ovary produces; oviduct carries. Egg movement is supported by the tract and does not imply a swimming flagellum or completed fertilisation.
Section B14.2 · Sexual reproduction in humans
Cross-referenced to the 2028–2029 0653 section using original teaching from the related single-science courses. A 0653-specific objective-by-objective and Core/Supplement review is in progress. Written practice is self-checked and does not demonstrate supervised laboratory competence or award an official Cambridge grade.
Before you begin
- Recall cell nuclei, gametes, diffusion, respiration and the difference between a cell and an organ.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is another name for an oviduct?
What you will learn
- Separate ovaries from the oviducts
- Trace the egg route toward the uterus
Original teaching model.
| Feature | Meaning |
|---|---|
| Ovary | Egg-producing organ |
| Oviduct | Tube to uterus |
| Normal fertilisation | Usually in an oviduct |
| Movement | Transport differs from self-propulsion |
Separate ovaries from the oviducts
An ovary produces egg cells and secretes oestrogen and progesterone; an oviduct is a tube leading toward the uterus. In the model an ovary lies near the wider end of the oviduct rather than being drawn as a sealed continuation of its lumen. After release, an egg can enter the oviduct route. This relationship matters when a learner mistakes every rounded end of a tube for part of the tube itself.
Oviducts, also called fallopian tubes, carry egg cells toward the uterus and are the usual location where sperm and egg meet for fertilisation. The ovary is not normally the implantation site, and fertilisation is not identical to egg release. A statement about the route identifies location and transport; it does not guarantee fertilisation or successful later development.
Trace the egg route toward the uterus
Egg cells do not have a swimming flagellum like sperm. Their movement along the oviduct depends on the surrounding transport system, including cilia and muscle activity. “Not self-propelled” is therefore more accurate than “an egg never moves”. The gamete’s own adaptations and the reproductive tract’s transport mechanisms must be kept distinct in a structure–function answer.
For an unfamiliar cutaway, trace the tube back to the uterus before naming it. Then locate the adjacent ovary as the separate producing organ. A diagram alone does not prove that a released egg has been fertilised or an embryo has implanted. Those are later events with different evidence. The normal route is a classroom model, not a diagnosis of a particular person’s reproductive system.
Sources for this lesson
Pause and explain
What does an egg in an oviduct prove by itself?
Worked example
A diagram shows an egg moving along an oviduct. Does movement mean it has a flagellum?
Show the worked solution
- Identify the cell’s structure separately.
- Attribute transport to the tract.
Answer No. An egg is not self-propelled by a flagellum; the oviduct transport system moves it.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Explain the different roles of ovary and oviduct.
Give me a hint
One produces; the other carries.
Compare my reasoning
- Name egg production.
- Name transport and usual fertilisation location.
Ovary produces egg cells and secretes oestrogen and progesterone. Oviduct carries an egg toward the uterus and is the usual site of fertilisation.
Look for these in your work
- Separate production and transport
- Include the usual fertilisation site
Correct “egg transport proves eggs swim with tails”.
Give me a hint
Distinguish transport by a tract from cell self-propulsion.
Compare my reasoning
- Recall the egg lacks a flagellum.
- Use cilia and muscle transport in the surrounding tube.
Eggs lack a swimming flagellum; oviduct cilia and muscle activity support their transport toward the uterus.
Look for these in your work
- Correct cell structure
- Identify the surrounding transport system
A tube connects to the uterus and has an ovary nearby. Identify both without claiming observed fertilisation.
Give me a hint
Use connections for anatomy and retain the event limit.
Compare my reasoning
- Name the connecting tube.
- Name the adjacent producing organ.
The tube is an oviduct and the nearby organ an ovary. Their positions alone do not show sperm–egg nuclear fusion.
Look for these in your work
- Identify both by relationship
- Retain the fertilisation evidence limit
Common mistakes
- Movement does not mean self-propulsion.
- Release is not fertilisation.
What can you explain now?
What does an egg in an oviduct prove by itself?
Compare with the explanation
Its location in the transport route
Location alone does not establish later nuclear fusion.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Explain separate ovaries from the oviducts and trace the egg route toward the uterus. Use the diagram key and check your reasoning before opening the solutions.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.