The planarian
What kind of nervous system do flatworms have?
The nervous system of a free-living flatworm such as Planaria
Do flatworms have a nervous system?
The bilaterally flattened body of flatworms
preserves a common organization of the central nervous system
(CNS). The CNS of flatworms consists of: (i) the orthogon, composed of main longitudinal nerve cords
Do all worms have a nervous system?
| Earthworm | Order: Opisthopora | Suborder: Lumbricina |
|---|
What animals have no nervous system?
The only multicellular animals that have no nervous system at all are
sponges and microscopic bloblike organisms called placozoans and mesozoans
. The nervous systems of ctenophores (comb jellies) and cnidarians (e.g., anemones, hydras, corals and jellyfishes) consist of a diffuse nerve net.
Do flatworms have a body?
Flatworms have no body cavity other than the gut
(and the smallest free-living forms may even lack that!) and lack an anus; the same pharyngeal opening both takes in food and expels waste.
Do flatworms have memory?
Researchers discover
flat worms retain memories even after decapitation
. (Phys.org) —A pair of researchers from Tufts University has found that a type of flat worm is able to remember events that transpired prior to having its entire head removed.
Do flatworms feel pain?
Simple animals such as worms and insects
do not suffer pain in the human sense
, but they do use nociceptive receptor systems to steer away from potentially damaging conditions. Neurobiologist Marco Gallio, Ph. D., and his team report that planarian
Do worms feel love?
“Importantly, and enabled by the experimental virtues of the worm, the research shows this is dependent on the hormone nematocin, the ancient nematode version of a human hormone called oxytocin. These hormones are known to regulate sociability and have been called the ‘love hormone’.
Can a worm live if cut in half?
If an earthworm is split in two, it will not become two new worms.
The head of the worm may survive and regenerate its tail
if the animal is cut behind the clitellum
What animal has 800 stomachs?
| Etruscan shrew | Phylum: Chordata | Class: Mammalia | Order: Eulipotyphla | Family: Soricidae |
|---|
Which animal has no brain and heart?
They don’t have a heart, lungs or a brain either! So how does a jellyfish live without these vital organs? Their skin is so thin that they can absorb oxygen right through it, so they don’t need lungs.
Which animal is never sleep?
Bullfrogs
… No rest for the Bullfrog. The bullfrog was chosen as an animal that doesn’t sleep because when tested for responsiveness by being shocked, it had the same reaction whether awake or resting. However, there were some problems with how the bullfrogs were tested.
What are the harmful effects of flatworms in man?
After years of infection, the parasite
can damage the liver, intestine, lungs and bladder
. Rarely, it can also cause seizures, paralysis or spinal cord inflammation. More than 200 million people have this disease and more than 700 million people are at risk of infection.
How do flatworms affect humans?
Paragonimiasis is caused by
infection
with a flatworm. That’s a parasitic worm
Can flatworms live in humans?
There are a variety of parasitic worms that can take
up residence in humans
. Among them are flatworms, thorny-headed worms, and roundworms. The risk of parasitic infection is higher in rural or developing regions. The risk is great in places where food and drinking water may be contaminated and sanitation is poor.
