What are the different sense organs present in planaria and give their functions?
What are the different sense organs present in planaria and give their functions?
Additionally, the planarian has two visible sensory organs. The auricles are lateral flaps near the anterior of the animal. The auricles are chemoreceptors and sense chemicals in the water. Also near the anterior are two eyespots.
What is the function of the eye spots and the Auricles lobes extending from either side of the head in the head region of the planarian?
Many planarians have structures called eyespots in their anterior (head) region, which detect light. Planarians can sense and respond to chemical stimuli in their environment by using chemoreceptors mainly localized on the sides of their bodies (auricles).
Which cells are responsible for regeneration in planarians?
Regeneration in planarians depends on the presence of stem cells called neoblasts. These cells are distributed throughout the body and, when part of the worm has been amputated, they are activated to reform the tissues that have been removed (Wagner et al., 2011).
Why do Planaria have ladder like organs?
They can reproduce asexually simply by pinching in half; each half grows a new half. Scientists say planaria have ladder like organs. Why? It consists of a brain and nerve cords arranged in a ladder-like configuration.
What kind of eye does a Planaria have?
A brown speckled planarian {Dugesia tigrina} swimming diagonally in a dish of water on a white background. The planarian’s eye spots (ocelli) and auricles are plainly visible in this closeup on its head. The dark portions of the eye are not actually the photosensory nerves.
How does a planarian flatworm sense the light?
Light-averse planarian flatworms, known for their incredible ability to regenerate lost body parts, shy away from light even after they have been decapitated. But many do have two lensless, primitive “eyespots” on their heads that can detect the intensity of light. One may also ask, how do flatworms sense their environment?
How are planaria able to regenerate lost body parts?
Planaria exhibit an extraordinary ability to regenerate lost body parts. For example, a planarian split lengthwise or crosswise will regenerate into two separate individuals. Some planarian species have two eye-spots (also known as ocelli) that can detect the intensity of light, while others have several eye-spots.
Where are the cilia located in the planarian body?
Specifically, cilia that populate the ventral epithelium of the planarian body are highly conserved, with a 9 + 2 axoneme and a full complement of inner and outer arm dynein motors.
