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Lecture 51

BIOL 1010 Lecture 51: Lecture 51

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University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

c98 Bio 1010 Key differences & similarities of Tapeworms & Bloodsucking leeches (Both parasites): o Both composed of repeated segments. o Tapeworm segments filled with reproductive organs & shed from posterior end. o Tapeworms are flatworms with no body cavity, & in parasitic lifestyle have no Gastrovascular cavity. o Leeches have a true coelom & complete digestive tract. Section 20.11 – Arthropods are segmented animals with jointed appendages & an exoskeleton. Arthron – joint, Pod - foot Crayfish, lobsters, crabs, barnacles, spiders, ticks, insects. Phylum Arthropoda regarded as most successful animal phylum. Diversity & success related to their segmentation, exoskeleton, & jointed appendages. The arthropod body is covered by an exoskeleton protecting the animal & provides point of attachment for muscles that move the appendages. o Appendages adapt for sensory reception, defence, feeding, walking, & swimming. o Exoskeleton is a cuticle, nonliving veering in arthropods is hardened by layers of protein Exoskeleton is thick around the head where its main function is to house & protect the brain. It is paper thing &
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