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Chapter 2.1 Invertebrates Study Guide ______ Pouch lined with cells that release enzymes (stomach) A. Invertebrate ______ A space inside the body that holds your gut B. Bilateral Symmetry ______ Clumps of nerve cells C. Radial Symmetry ______ Animals without backbones D. Open circulatory system ______ Blood is pumped through network of vessels E. Ganglia ______ A body with two similar halves F. Asymmetrical ______ Heart pumps blood through vessels into sinuses G. Coelom ______ Identical or nearly identical repeating body parts H. Closed circulatory system ______ Body is arranged in a circle around a central point I. Segment ______ A sponge has this type of symmetry J. Gut Section 1 Most animals have __________ symmetry or bilateral symmetry. Unlike other animals, ___________ have no symmetry. This is called ______________. Sponges have special cells called _________ cells to digest their food. ___________ have special stinging cells to catch their prey. Cnidarians have 2 body forms: the _________ and the __________. Tapeworms and flukes are ____________ flatworms. Section 2 A sponge uses ________ to pull water in and releases water out through _____________. (an osculum or pores) Cnidarians have __________ symmetry and flatworms have ___________ symmetry. A cnidarian that looks like a mushroom with tentacles streaming down is a called a ____________. What form do most cnidarians have through out their life? ______________ Invertebrates make up _______ percent of all animals. What cells do sponges have that no other animal have? _______________ Which of the following animals do NOT have ganglia? a. annelid worms c. flatworms b. cnidarians d. mollusks Which animal phylum contains most species? Why is a sponge classified as an animal, if it has no head and no gut? Sponges belong to which phylum? a. Porifera c. Cnidara b. Chordata d. Mollusca Jellyfish, hydras, and sea anemones are members of which phylum? c. Porifera c. Cnidara d. Chordata d. Mollusca A Planarian is a type of ___________. Other types of __________ are _______ and tapeworms. What are ganglia Which invertebrate group(s) do not have a ganglia? What is the human gut? What phylum are sponges? Why? What is a common fresh water cnidarian?
