what are the characteristics of platyhelminthes
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Characteristics Other Platyhelminthes characteristics shared by these creatures is they are bilaterally symmetrical, this means the left and right sides of their bodies are mirror images of each other. They have distinctive head and tail ends and their body contains three cell layers.
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General Biology/Classification of Living Things/Eukaryotes/Animals/Phyla They are dorsoventrally compressed (i.e., flat). Animals in this phylum are acoelomate, triploblastic, bilaterally symmetrical, and unsegmented. Platyhelminths have a simple anterior brain and a simple ladder-like nervous system.hey are dorsoventrally compressed (i.e., flat). Animals in this phylum are acoelomate, triploblastic, bilaterally symmetrical, and unsegmented. Platyhelminths have a simple anterior brain and a simple ladder-like nervous system.
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Planarian (Dugesia Tigrina) Circulatory System Overview. Platyhelminthes consists of the unsegmented flatworms, which includes both free-living and parasitic species. They have bilateral symmetry, and can move by using layers of muscles, or in some species, by gliding along a slime trail using cilia.Flatworms are slightly less developed than segmented worms due to their lack of a circulatory system and complete digestive system.ome flatworms have primitive light-sensing eyes that allow them to move either towards or away from light, while other species have different types of sensors on their bodies, including chemical, balance, and water movement receptors. Most species of flatworms reproduce either sexually or asexually.
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- Characteristics of Protists. 1  mostly unicellular, some are multicellular (algae) 2  can be heterotrophic or autotrophic. 3  most live in water (though some live in moist soil or even the human body) 4  ALL are eukaryotic (have a nucleus) 5  A protist is any organism that is not a plant, animal or fungus.
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"Amber M.Size: 73The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons areDendritesThe two types of cells of the nervous system areNeurons (nerve cells) and Neuroglia (glia)The functional connection between two neurons is asynapseThe nervous system (functions?)detects changes in the internal or external environment, controls the movement of muscles, and integrates information from several sources and uses it to determine an appropriate response.. Neurons that conduct impulses from the CNS to muscles or glands aremotor neuronsSensory receptors (do what?)monitor light, monitor sound, and detect changes in and outside the body.Three general functions of the nervous system areMasses of myelinated nerve fibers appear (color?)A neuron may have (characteristics?)supports the axon from within. Which of the following is unique to neurons?Myelin (what is it?) A myelinated nerve fiber is ______, whereas an unmyelinated nerve fiber is ______.Myelin is rich in ___________. (what organic molecule?)Which of the following is (are) a type of neuroglia?Which cells produce myelin in the brain and spinal cord? A reason that the axons in the CNS and PNS differ in their ability to regenerate after injury is thatMost of the neurons in the brain and spinal cord are In order for a severed peripheral nerve to regenerate and recover its original function, nerve fibers must sprout and enter 21. Which of the following cells is only found in the PNS?Dendrites on unipolar neurons are parts of Clusters of neuron cell bodies in the PNS are called _____.Which of the following neuroglia are not part of the CNS? Synaptic knobs are at the ends ofPresynaptic neurons release neurotransmitters by When an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response toIf a neuron receives a series of stimuli whose effect is excitatory but subthreshold, the neuron is more excitable to incoming stimulation than before and is said to be Transmitting an impulse from one neuron to another involves a (n)Action potentials are related to impulses conducted along an axon in that A stimulus great enough to change the membrane potential and propagate an action potential is said to havereached _________.When a nerve fiber is polarized, the concentration of (think sodium and potassium) Saltatory conduction (how is it compared to axons without myelin)The most rapid conduction of an impulse along an axon occurs on a fiber that is Which of the following ions cross neuron cell membranes most readily?If a resting potential becomes more negative, the membrane is What is the correct sequence of events along an axon that follows a membranereaching threshold potential?A nerve cell membrane becomes depolarized as a result of Which of the following molecules is responsible for ""runner's high,"" a good feeling that accompanies long-distance running?An excitatory postsynaptic potential lasts for about Each neuron in the CNS may receive input fromAn action potential is triggered if (think EPSPs)The neurotransmitter that controls skeletal muscle contraction isViagra is a drug used to treat erectile dysfunction by dilating arteries in the penis.The neurotransmitter that Viagra affects isDrugs that increase the actions of norepinephrine and/or serotonin by keeping them in synapses longer are most likely used to treatIn reuptake (what happens to the neurotransmitter?) Drugs that inhibit the enzyme monoamine oxidaseThe types of neurons that are organized into neuronal pools are Convergence refers toDiverging axons amplify an impulse by Neural stem cells can be harvested from autopsies andstored, alive, in banks, whereas neurons cannot, becauseMigraine results from An immune response that affects the myelin coating on axons throughout the spinal cord and brain, triggering inflammation and leaving scars isDrugs that decrease membrane permeability to sodium . Opiate drugs derived from poppies relieve pain in humans because the human nervous system hasMarjorie takes an anti-anxiety drug so that she can sleep better and remain calm enough to study effectively. She begins by taking 25 milligrams every evening, butwithin a month, this dose is no longer helping, so she takes two pills. After another month, this dosage is no longer effective. This is happening because (think drug and receptor numbers)The neurotransmitter most likely produced when a person uses a drug that creates a sense of well-being isA drug that functions as an agonist A nerve is a single neuron that transmits impulsesNeuroglia are specialized to react to environmental change, and neurons support neuroglia. The brain and spinal cord comprise the central nervous system.Sensory receptors are part of the CNS The somatic nervous system controls voluntary actions and the autonomic nervous system oversees involuntary actions.Axon branches are called collaterals. Myelin is composed largely of carbohydrates.Nodes of Ranvier lie between neurons. Astrocytes structurally support neurons and also provide important signals and nutrients to neurons.. Interneurons are specialized to carry impulses from receptor cells into the brain or spinal cord. A mixed nerve includes different neuroglial cells.The space between neurons is called the neuronal space. During the absolute refractory period, a stimulus of high intensity may trigger a nerve impulse.Because the response of a nerve fiber is all-or-none, a greater intensity of stimulus does not produce a stronger impulse. Enkephalins are neuropeptides.In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers. Several nerve fibers converging onto one neuron amplifies impulses" If a neuron receives a series of stimuli whose effect is excitatory but subthreshold, the neuron is more excitable to incoming stimulation than before and is said to be Transmitting an impulse from one neuron to another involves a(n) Action potentials are related to impulses conducted along an axon in that A stimulus great enough to change the membrane potential and propagate an action potential is said to have reached _____. When a nerve fiber is polarized, the concentration of (think sodium and potassium)
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Annelida Annelid Characteristics. The fundamental characteristic of the phylum is the division of the body into a linear series of cylindrical segments, or metameres. Each metamere consists of a section of the body wall and a compartment of the body cavity with its internal organs.he fundamental characteristic of the phylum is the division of the body into a linear series of cylindrical segments, or metameres. Each metamere consists of a section of the body wall and a compartment of the body cavity with its internal organs.
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What are Three characteristics of the phylum chordata?    Chordates (or members of the phylum Chordata), share the following  characteristics:       dorsal nerve cord which is a bundle of nerve fibres which  runs down the back. It connects the brain with the lateral muscles  and other organs.ll chordates have the following characteristics at some point in their lives : 1.notochord-cartilaginous rod running underneath, and supporting, the nerve cord. In vertebrates, it develops into the vertebral column.
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Flatworm The flatworms, or Platyhelminthes, Plathelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning flat and ἕλμινς (root: ἑλμινθ-), helminth- , meaning worm) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.he flatworms, or Platyhelminthes, Plathelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning flat and ἕλμινς (root: ἑλμινθ-), helminth- , meaning worm) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
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- Flatworms belong to the Phylum Platyhelminthes (Latin for Flatworms, although it sounds much more official), whose characteristics shape - flat - is an evolutionary answer to a problem of multicellular life: as an animal gets bigger, the inside cells get farther and farther away from the outside, so that oxygen gets depleted before it reaches them and wastes build up on the way out.
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Flatworms Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphological feature that differentiates them from nematodes (roundworms).urbellarians are free-living platyhelminthes and their main representative is planaria (Dugesia tigrina). Trematodes are parasites, which live inside a host,. The schistosome (Schistosoma mansoni) that causes schistosomiasis is an example of one.
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- The Phylum: Platyhelminthes includes the flatworms (Planaria, flukes & tapeworms) Three Classes treated here are Turbellaria, Trematoda and Cestoda. The Class Turbellaria is distinguished mainly on the appearance of the digestive tract.
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CLASSIFICATION OF PLATYHELMINTHES CLASSIFICATION OF PLATYHELMINTHES. (Girish Chandra). PHYLUM PLATYHELMINTHES. Commonly known as flat worms, they are acoelomate, triploblastic and bilaterally symmetrical animals which have no skeleton, respiratory and circulatory systems.Alimentary canal when present is in blind sac plan.lass TURBELLARIA (Dugesia; Bipalium; Leptoplana; Notoplana). They are free living eddy worms, with flattened body and mouth located on the ventral side. Suckers are absent and epidermal cells are multiciliated.
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- Members of the phylum Platyhelminthes are flatworms, such as the planarian. Grubs and tapeworms are other examples of flatworms. Flatworms display bilateral symmetry; that is, the left and right halves of the body are mirror images of one another.
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- as my interests are far and wide. The platypus is not difficult to classify: it possesses the defining characteristic of mammals, which is nurturing the young with mothers' milk. It has all other characteristics of mammals, such as breathing through lungs, having fur on its body, and having a four-chambered heart.ll other mammals give birth to live young. The echidna was hard to classify because it had all the other attributes of a mammal besides giving birth to live young.
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Chapter 86 Helminths: Structure, Classification, Growth, and Development Introduction. Helminth is a general term meaning worm. The helminths are invertebrates characterized by elongated, flat or round bodies. In medically oriented schemes the flatworms or platyhelminths (platy from the Greek root meaning “flat”) include flukes and tapeworms.Roundworms are nematodes (nemato from the Greek root meaning “thread”).he helminths are invertebrates characterized by elongated, flat or round bodies. In medically oriented schemes the flatworms or platyhelminths (platy from the Greek root meaning “flat”) include flukes and tapeworms.
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- Three essential characteristics to observe while progressing through each animal phyla are symmetry, cephalization, and body cavity. There are two types of symmetry present in animals, bilateral like. humans, and radially symmetrical like a wheel. As the exception, sponges do not exhibit any type of symmetry.
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Platyhelminthes organisms classified as platyhelminthes obtain characteristics of various feeders parasitic- live and feed off of hosts detritus- feeds off of bodies and parts of non-living organic material
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- Important Characteristics: -. 1. They have flattened body on both sides, so they are called flatworms. They have bilaterally symmetrical body. 2. They may be free-living, for example, planaria. Some are parasites and live in the body of other animals like liver-fluke. 3. They have soft body without skeleton.
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- Important Characteristics: -. 1. They have flattened body on both sides, so they are called flatworms. They have bilaterally symmetrical body. 2. They may be free-living, for example, planaria. Some are parasites and live in the body of other animals like liver-fluke. 3.
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- Many of the most important and diagnostic mammalian characteristics serve to further intelligence and sensibility, promote endothermy, or to increase the efficiency of reproduction or the securing and processing of food. Basic structural body plan is inherited from Therapsid mammal-like reptiles.
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External morphology of Lepidoptera Platyhelminthes. are commonly called flatworms. There are both. parasitic. (dependent on a host organism for survival) and. free-living. forms of this group. Flatworms, either parasitic or free-living forms, have both sexes on the same individual, a condition referred to as. hermaphroditic. .
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What are the Characteristics of Phylum Nematoda? 1)Bilaterally symmetrical, and vermiform. 2)Body has more than two cell layers, tissues and organs. 3)Body cavity is a pseudocoel, body fluid under high pressure. 4)Body possesses a through gut with a subterminal anus.
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Characteristics Characteristics. Platyhelminthes is a term that covers some thirty four thousand species of flat worm. The following gives a brief outline of the Platyhelminthes characteristics shared by these creatures. The word Platyhelminthes comes from the Greeks words “ platy ” meaning flat and “ helmins ” meaning worm.
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List the general characteristics of annelids,? 13. There are no respiratory organs and the worms breathe through its moist skin. The three classes of Annelids are: Oligochaeta (earthworms); Polychaeta (sand worms); Hirudinea (leeches). Leeches are parasitic and are used by the medical profession to withdraw blood from humans in certain situations.Source(s): ATP-Man · 9 years ago. Thumbs up. 5. Thumbs down. 0. 1 comment. Loading .... Bilateral symmetry. 3. True body cavity (coelom) is partitioned by structures called septa. 4. The organs of the digestive, nervous, and circulatory systems penetrate the septa and run the length of the body. 5.
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Characteristics of Phylum Coelenterata (CNIDARIA) Characteristics of Phylum Coelenterata(CNIDARIA). Phylum coelenterata characteristics. 1. Dipoblastic body with two layers of cells, outer layer called ectoderm or epidermis and the inner layer known as the endoderm or gastrodermis. 2. Phylum coelenterata characteristics is they have a single opening into the body which acts as both the mouth and anus which functions in taking food and expelling wastes.
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Platyhelminthes: A body cavity lost or found? Introduction. Platyhelminthes, or flatworms, are considered by many to be ancestral to most of the metazoans that were to follow and for the first time we see the development of the final germ layer, the mesoderm, with its potential to form muscles and other structures.ut, unlike the other animals that are to follow, in flatworms the mesoderm remains as a solid mass of tissue without a coelom and the advantages that this adaptation could have provided to the group are lost. This probably explains why most of today's flatworms are parasitic rather than free living.