Web1) Phylum Platyhelminthes The phylum Platyhelminthes (platy, flat; helminth, worm) includes a diversity of marine, freshwater, and terrestrial worms, plus two rather important parasitic groups: the flukes and the tapeworms. Like cnidarians (= hydras, jellyfish, and corals), flatworms have a rather simple body plan and share some features with them. WebGas exchange occurs by diffusion across their membranes. Even in simple multicellular organisms, such as green algae, their cells may be close to the environment, and gas …
Flatworm Nutrition - University of Wisconsin–La Crosse
WebThere is neither a circulatory nor a respiratory system, with gas and nutrient exchange dependent on diffusion and cell-to-cell junctions. This necessarily limits the thickness of the body in these organisms, constraining them to be “flat” worms. Webflatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it. They are bilaterally symmetrical (i.e., the right and left sides … can ibuprofen cause numbness in face
Biology Lab Practical #1 Flashcards Quizlet
WebTake in oxygen and expel carbon dioxide directly through their skin = gas exchange surface Oxygen diffuses through the earthworm's body surface by dissolving in the moisture on … WebAug 26, 2010 · Since there is no circulatory or respiratory system, gas and nutrient exchange is dependent on diffusion and intercellular junctions. This necessarily limits the thickness of the body in these organisms, constraining them to be “flat” worms. WebSep 23, 2024 · Sponges live in intimate contact with water, which plays a role in their feeding, gas exchange, and excretion. Much of the body structure of the sponge is dedicated to moving water through the body so it can filter out food, absorb dissolved oxygen, and eliminate wastes. can ibuprofen cause night sweats