germ layers
- 1 What kind of skeleton do flatworms have?
- 2 Do flatworms have skin?
- 3 Do nematodes have exoskeleton?
- 4 Do flatworms shed?
- 5 What type of skeleton do chordates have?
- 6 Do flatworms have circular muscles?
- 7 Do flatworms have a muscular system?
- 8 Do flatworms have appendages?
- 9 Are flatworms Monoecious or dioecious?
- 10 Do flatworms poop?
- 11 What are three characteristics of flatworms?
- 12 Are flatworms symmetrical?
- 13 Are flatworms heterotrophic or autotrophic?
- 14 Is a planarian a flatworm?
- 15 What do flatworms look like?
- 16 Do flatworms have a nervous system?
- 17 What is the function of the pharynx in a flatworm?
- 18 Do chordates have a cuticle?
- 19 Do flatworms have intracellular digestion?
- 20 Does Chordata have exoskeleton?
- 21 Is a bird an endoskeleton or exoskeleton?
- 22 Is a worm bilateral?
- 23 What are circular muscles?
- 24 Are flatworms vertebrates?
- 25 Do flatworms have antennae?
- 26 Are flatworms decomposers?
- 27 What do flatworms do?
- 28 Do flatworms have a coelom?
- 29 Can humans poop worms?
- 30 What phylum do flatworms belong to?
- 31 Which flatworms are dioecious?
- 32 Why is there white worms in my poop?
- 33 Can tapeworms crawl out of your mouth?
- 34 Are flatworms prokaryotic or eukaryotic?
- 35 How do flatworms maintain homeostasis?
- 36 Why are flatworms so flat?
- 37 What are the two most obvious characteristics of flatworms?
- 38 How are flatworms classified and what are their characteristics?
- 39 Do flatworms have segmentation?
- 40 Where is the mouth of a flatworm?
- 41 Is flatworms radial or bilateral?
- 42 Which system in flatworms remains primitive?
- 43 Is a earthworm a flatworm?
- 44 Is a fluke a worm?
- 45 Is a tapeworm a flatworm?
- 46 Do flatworms have a heart?
- 47 Where is the flatworms digestive system?
- 48 What is the difference between flatworm and roundworm?
- 49 Do flatworms have tissues?
- 50 Do flatworms have eyes?
- 51 What type of movement do flatworms have?
- 52 Do all flatworms have a pharynx?
- 53 Do flatworms have muscles?
- 54 Which side of the body are the mouth and pharynx of a planarian located?
What kind of skeleton do flatworms have?
Flatworms have a more complex structure than cnidarians but they lack a true coelom. Despite this, they still possess a hydrostatic skeleton. These animals are of a flattened nature and possess muscle cells arranged in layers with a loose packing of cells derived from the mesoderm called mesenchyme.
Do flatworms have skin?
The skin of all species is a syncitium, which is a layer of cells that shares a single external membrane. Trematodes are divided into two groups, Digenea and Aspidogastrea (also known as Aspodibothrea).
Do nematodes have exoskeleton?
The nematode body is encased in a cuticle, a flexible but tough exoskeleton, or external skeleton, which offers protection and support. The cuticle contains a carbohydrate-protein polymer called chitin.
Do flatworms shed?
Yes, some members of the phylum Platyhelminthes shed. These members are usually the parasitic flatworms that live in the intestines, tissues, or…
What type of skeleton do chordates have?
A true endoskeleton is derived from mesodermal tissue. Such a skeleton is present in echinoderms and chordates.
Do flatworms have circular muscles?
The planarian has opposing muscles, circular muscles that extend around the flatworm and longitudinal muscles that extend from anterior to posterior of the flatworm. If the circular muscles contract, the flatworm changes shape to become long and thin.
Do flatworms have a muscular system?
The well-developed muscular system present in flatworms is comprised of a subcuticular musculature consisting of layers of circular, longitudinal, and diagonal muscles close to the epidermis, and a mesenchymal musculature consisting of dorsoventral, transverse, and longitudinal fibres passing through the mesenchyme.
Do flatworms have appendages?
They are characterized by a segmented body and jointed appendages. In the basic body plan, a pair of appendages is present per body segment. Within the phylum, classification is based on mouthparts, number of appendages, and modifications of appendages.
Are flatworms Monoecious or dioecious?
Most flatworms can reproduce sexually or asexually. Most are monoecious. Most of these have developed ways of avoiding self-fertilization. Development may be direct (eggs hatch into tiny worms that resemble the adults) or indirect (with a ciliated larval form).
Do flatworms poop?
Flatworms have an excretory system with a network of tubules throughout the body that open to the environment and nearby flame cells, whose cilia beat to direct waste fluids concentrated in the tubules out of the body.
What are three characteristics of flatworms?
- Flatworms have no true body cavity, but they do have bilateral symmetry. …
- Flatworms have an incomplete digestive system. …
- Flatworms do not have a respiratory system. …
- There are no blood vessels in the flatworms.
Are flatworms symmetrical?
Flatworms’ bodies are bilaterally symmetrical and they have a defined head and tail region. They have a central nervous system containing a brain and a nerve cord. Clusters of light-sensitive cells on either side of their head make up what are called eyespots.
Are flatworms heterotrophic or autotrophic?
Flatworms are free-living heterotrophs or parasites.
Is a planarian a flatworm?
Planaria are flatworms in the phylum Platyhelminthes with amazing regeneration abilities giving them the title ‘immortal under the edge of a knife’. There are many different species that inhabit freshwater, marine and terrestrial ecosystems.
What do flatworms look like?
Flatworms have flat, symmetrical, leaf-shaped bodies that grow to a size smaller than a quarter. The oyster flatworm is cream-colored with short tentacles on its sides and has eyespots in two rows along its head.
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 and transverse commissures that form a ladder-like network.
What is the function of the pharynx in a flatworm?
Pharynx: a muscular tube through which the flatworm can suck food into its gastrovascular cavity. The opening into the pharynx could be considered the mouth, but since this animal has a two-way gut, that opening also must function as the anus.
Do chordates have a cuticle?
Notochord, when present, restricted to tail; body covered with tunic, but sometimes only cuticle; atrium, absent in Appendicularia, dorsal and often paired in embryonic development; heart present; generally sessile (attached) as adults; see below Tunicates.
Do flatworms have intracellular digestion?
Intracellular Digestion
Most animals with soft bodies use this type of digestion, including Platyhelminthes (flatworms), Ctenophora (comb jellies), and Cnidaria (coral, jelly fish, and sea anemones).
Does Chordata have exoskeleton?
Exoskeleton | Endoskeleton |
---|---|
Provides overall protection (External) | Doesn’t provide overall protection, however most key organs are well protected in many (skull, spine, rib cage in humans as example) |
Is a bird an endoskeleton or exoskeleton?
Birds do not have exoskeletons, because they are vertebrates. This means they have a backbone and an internal skeleton for protection and support….
Is a worm bilateral?
The three main groups of worms are flatworms, roundworms, and segmented worms. Worms are invertebrates because they do not have a backbone. Worms have bilateral symmetry. Worms have cells, tissues, organs, and systems.
What are circular muscles?
”’circular muscles. – muscle layer encircling the body between the epidermis and longitudinal muscle layer. Last updated on June 24th, 2021. AD.
Are flatworms vertebrates?
Flatworms are invertebrates in Phylum Platyhelminthes. Flatworm adaptations include mesoderm, muscle tissues, a head region, and bilateral symmetry.
Do flatworms have antennae?
Flatworms are non-parasitic, free-living animals. Their bodies are more or less flattened ovals that vary from one to five inches (2.54 to 12.7 cm) in length. There are two small sensory organs on the forward ends of the bodies that look similar to cat ears and that function as antennae.
Are flatworms decomposers?
Since most flatworms are parasitic in nature, they are mostly responsible for sickness or disease. However, some free-living flatworms do help the environment by acting as decomposers.
What do flatworms do?
Flatworms may regulate population dynamics of zooplankton in ponds. They are also consumers of protozoans, rotifers, and algae, and help to regulate populations of these organisms.
Do flatworms have a coelom?
Flatworms are hermaphroditic and capable of sexual and asexual reproduction. Their bodies have only a single opening, which serves as both a mouth and an anus. They are, as their name implies, flat. They have no circulatory system or body cavity (coelom), but they do have an excretory and digestive system.
Can humans poop worms?
Any worms in your gut will eventually pass out in your poo. You may not notice this. To avoid becoming infected again or infecting others, it’s very important during the weeks after starting treatment to wash your hands: after going to the toilet.
What phylum do flatworms belong to?
flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates.
Which flatworms are dioecious?
There are monoecious hermaphrodite flatworms, such as planaria and taenias, as well as dioecious (having male and female specimens) species, such as schistosomes.
Why is there white worms in my poop?
Pinworms, also known as threadworms, are tiny white or light gray worms that cause the common infection called enterobiasis. Usually found in children, pinworm can be treated with anti-parasitic medications that do not require a prescription.
Can tapeworms crawl out of your mouth?
After sedating the man, a team of physicians at the Institute of Liver and Biliary Sciences Hospital in New Delhi was able to extract the worm by pulling it through his mouth with a pair of forceps. When removed, the tapeworm measured 6.1 feet and was classified as a Taenia solium, otherwise known as a pork tapeworm.
Are flatworms prokaryotic or eukaryotic?
Kingdom: Animalia – Flatworms fall under the animal kingdom that is characterized by multicellular eukaryotic organisms.
How do flatworms maintain homeostasis?
Flatworms have two tubular excretory organs that excrete wastes as well as maintaining the homeostasis of its salt to water ratio. It works by using flame cells located on the edges of the tubules to propel water and waste with tiny cilia through the tubules and out of the body.
Why are flatworms so flat?
They have a flat body because they do not have a coelom or even a pseudocoelom. They also lack a respiratory system. Instead, their cells exchange gases by diffusion directly with the environment. They have an incomplete digestive system.
What are the two most obvious characteristics of flatworms?
What are the defining features of a flatworm? Flatworms are soft, flattened worms that have tissues and internal organ systems. They are the simplest animals to have three embryonic germ layers, bilateral symmetry, and cephlization.
How are flatworms classified and what are their characteristics?
Flatworms are unsegmented worms with a tail and a head end. They are bilaterally symmetrical with a definite upper and lower surface. They have no body cavity or and no specialized respiratory or circulatory organs. This is the reason behind the flat shape, common to all flatworms.
Do flatworms have segmentation?
Taxonomic level: phylum Platyhelminthes; grade of construction: organs derived from three tissue layers; symmetry: bilateral; type of gut: blind; type of body cavity other than gut: none; segmentation: absent; circulatory system: none; nervous system: small bundles of nerves (ganglia), two ventral nerve cords; …
Where is the mouth of a flatworm?
Flatworms possess a ‘blind gut’, they have a mouth but no opening at the lower end of the alimentary canal through which solid waste is eliminated from the body.
Is flatworms radial or bilateral?
The phylum Platyhelminthes, the flatworms, shows bilateral symmetry. In bilateral symmetry, you create two matching halves by drawing a line from the anterior (head) end of the organism to the posterior (tail) end.
Which system in flatworms remains primitive?
Flatworms lack a circulatory system but possess a primitive excretory system (protonephridia) and an array of secretory organs that aid in digestion, protection from predators, locomotion, prey capture and the prevention of desiccation in terrestrial environments.
Is a earthworm a flatworm?
As nouns the difference between earthworm and flatworm
is that earthworm is a worm that lives in the ground while flatworm is any of very many parasitic or free-living worms, of the phylum platyhelminthes , having a flattened body with no skeleton or body cavity.
Is a fluke a worm?
The flukes (Trematoda) are a class of parasitic worms belonging to the phylum Platyhelminthes…. The symmetrical body of a fluke is covered with a noncellular cuticle. Most are flattened and leaflike or ribbonlike, although some are stout and circular in cross section.
Is a tapeworm a flatworm?
tapeworm, also called cestode, any member of the invertebrate class Cestoda (phylum Platyhelminthes), a group of parasitic flatworms containing about 5,000 species.
Do flatworms have a heart?
Flatworms do not have a circulatory system in the usual sense. There are no veins, lymph nodes, or arteries. Instead, because they are fairly small in size and are so flat, flatworms are able to breathe through their ‘skin,’ which is really just integument, a moist outer covering.
Where is the flatworms digestive system?
Like the cnidarians, flatworms have a digestive system with only a single opening into the digestive cavity, but in independently living marine flatworms the cavity branches into all parts of the body (Fig. 3.37 B). These flatworms feed through a pharynx.
What is the difference between flatworm and roundworm?
Flatworms | Roundworms |
---|---|
They do not have a body cavity and thus are acoelomates. | They are pseudocoelomates i.e. they have a body cavity between their mesoderm and endoderm layers. |
Do flatworms have tissues?
Flatworms have three embryonic tissue layers that give rise to surfaces that cover tissues (from ectoderm), internal tissues (from mesoderm), and line the digestive system (from endoderm).
Do flatworms have eyes?
Eyespots. Flatworms have prominent eyespots. These constitute the flatworm’s most prominent sensory organs. However, while the eyespots resemble eyes, the organs are much more simple.
What type of movement do flatworms have?
Small flatworms (Platyhelminthes) and some of the smaller molluscan species move along the bottom by ciliary activity. On their ventral (bottom) surface, a dense coat of cilia extends from head to tail. The direction of the ciliary beat is tailward, causing the animal to glide slowly forward.
Do all flatworms have a pharynx?
Most other flatworms, however, have conspicuous digestive systems. The digestive system of turbellarians typically consists of mouth, pharynx, and intestine. In the order Acoela, however, only a mouth is present; food passes directly from the mouth into the parenchyma, to be absorbed by the mesenchymal cells.
Do flatworms have muscles?
Although musculoepithelial cells have been found in some flatworms, the muscle cells in most are distinct from the epithelial cells. There is a layer of circular muscle fibres immediately under the epidermis, a layer of diagonal fibres, and a still deeper longitudinal layer.
Which side of the body are the mouth and pharynx of a planarian located?
Planaria (Genus Dugesia) lives in fresh water ponds and is a carnivore. The pharynx can be protruded from the mouth which is in the middle of the ventral side of the animal.