5 Questions
What is the role of the vitellaria in the female reproductive system of Platyhelminthes?
Molds many yolk glands
Which organ is NOT absorbed by the Planaria when it is hungry?
Neoblasts
What occurs in the genital vacuole of Platyhelminthes?
Storage of sperm from another worm
What enables Planaria to regenerate after losing body parts during hunger?
Interstitial cells
Where are the ovaries located in Platyhelminthes?
Anterior of the body
Study Notes
Platyhelminthes (Flatworms)
Female Reproductive System
- The female reproductive system consists of two ovaries located in the anterior part of the body.
- The ovaries are connected to two oviducts, which lead to many vitellaria (yolk glands).
- The genital pore, located behind the mouth, opens into a genital vacuole that contains a seminal receptacle, which stores sperm from another worm during copulation.
Hungering and Regeneration in Planaria
- Planaria can regenerate lost body parts when hungry, absorbing its own inner organs, including:
- Fertilization organs (oviparous)
- Yolk glands (Vitellaria)
- Other reproductive organs
- Intestine and muscles
- When food becomes available, the worm regenerates lost organs through the presence of neoblasts (adult stem cells, also known as interstitial or archaeocytes).
- In nine months, a Planaria can lose up to two-thirds of its body size, but can then regenerate lost organs when food becomes available.
This quiz covers the reproductive system and regeneration in flatworms, specifically in Planaria.
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