An ovum is released from the ovary at ovulation…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
An ovum is released from the ovary at ovulation.
- Which part of the oviduct collects it, and what helps?
- In which part does it usually meet a sperm?
- Which part of the oviduct leads it to the uterus?
- A sperm reaches the ampulla by way of the vagina, the cervix and the uterus. Which part of the oviduct must it pass? What happens to fertilisation if this part is blocked on both sides?
Need a reminder? The key ideaShow
An ovary is to cm long. The follicles lie in its cortex. The oviduct has the infundibulum, the ampulla and the isthmus. Fertilisation is in the ampulla. The wall of the uterus has the perimetrium, the myometrium and the endometrium. The reproductive life of a woman runs from the first menstruation to menopause, about years of age.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The infundibulum. The finger like fimbriae at its edge help to collect the ovum.
Step 2. (b) In the ampulla, where fertilisation takes place.
Step 3. (c) The isthmus, the narrow part that joins the uterus.
Step 4. (d) The sperm must pass the isthmus. If it is blocked on both sides, no sperm reaches the ampulla, so fertilisation cannot happen.
Answer: (a) infundibulum, with its fimbriae; (b) ampulla; (c) isthmus; (d) isthmus, and fertilisation is not possible.
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