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Biochemistry
Introduction to Biochemistry
Water and Mineral Salts
Carbohydrates
Lipids
Proteins
Enzymes
Nucleic Acids
Cell Biology
Cell Organization
Membranes
Cytoskeleton and Cell Movement
Cellular Digestion and Secretion
Cell Nucleus
Cell Division
Photosynthesis
Cellular Respiration
Protein Synthesis
Microbiology
Bacteria
Protists
Fungi
Virus
Zoology
Introduction to Taxonomy
Poriferans
Cnidarians
Platyhelminthes
Nematodes
Annelids
Molluscs
Arthropods
Echinoderms
Chordates
Fishes
Amphibians
Reptiles
Birds
Mammals
Physiology
General Histology
Blood
Metabolism and Nutrition
Digestion
Respiration
Circulation
Excretion
Skin and Coverings
Musculoskeletal System
Nervous System
Vision
Hearing and Balance
Endocrine System
Immune System
Gametogenesis
Reproduction
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View chapter-related images
platyhelminthes planaria taenia schistosome platyhelminth digestive system
platyhelminth excretory system platyhelminth nervous system cephalization
turbellarians trematodes cestodes reproduction in planaria
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What are the best known representatives of the platyhelminth phylum?
The most popular representatives of the platyhelminthes are worms that cause human diseases, like taenia and schistosome. The planaria, since it is been extensively studied in Biology, is also well-known.
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What is the main external morphological feature that differentiates platyhelminthes from other worms (nematodes)?
Platyhelminthes are also known as flatworms because they are worms with a flat body. This is the main external morphologic feature that differentiates them from nematodes (roundworms).
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How many germ layers originate the body of platyhelminthes? In relation to this characteristic how are these animals classified?
Platyhelminthes are the first triploblastic animals (remember that cnidarians are diploblastic), i.e., they present three germ layers: ectoderm, mesoderm and endoderm.
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Embryology
General Embryology
Extraembryonic Membranes
Botany
Plant Classification and Life Cycles
Bryophytes
Pteridophytes
Gymnosperms
Angiosperms
Plant Tissues
Plant Physiology
Genetics
Fundamentals of Genetics
Mendel's Laws
Variations of Inheritance
Linkage and Crossing Over
Sex and Sex-Linked Inheritance
Blood Groups
Karyotype and Genetic Diseases
Genetic Distribution
Genetic Manipulation
Evolution
Hypothesis on the Origin of Life
Evolutionary Theory
Ecology
Notions on Ecology
Earth Biomes
Energy and Matter in Ecosystems
Biogeochemical Cycles
Biodiversity
Ecological Interactions
Ecological Succession
Populations
Environmental Problems
Diseases
Notions on Parasitism
Bacterial Infections
Protozoan Infections
Fungal Infections
Viral Infections
AIDS
Worm Infections
Prion Diseases
Degenerative Diseases
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