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Recent Micro
Stack #15689
| Question | Answer |
|---|---|
| Radial Symmetry | parts of an animal are arranged concentrically around an oral-aboral axis, and more than one imaginary plane through this axis yeilds halves that are mirror images of each other |
| Choanocyte | one of the flagellate collar cells that line cabities and canals of sponges |
| Cnidocyte | modified interstitail cell that holds the nematocyst; duringt development of th emnematocyst, the cnidocyst is a cnidoblast |
| Nematocyst | stinging organelle of cnidarians |
| Archeaocyte | ameboid cells of varied function in sponges |
| Pinacocytes | flattened cells composing dermal epithelium in sponges |
| Spongin | fibrous, collagenous material making up the skeletal network of horny sponges |
| Spicules | one of the minute caocareous or siliceous skeletal bodies found in sponges, radiolarians, soft corals, and sea cucumbers |
| Asconid | simplest form of sponges, with canals leaking directly from the outside to the interior |
| Syconoid | type of canal system in certain sponges |
| Polyp | individual of the phylum Cnidaria, generally adapted for attachment to the substratum at the aboral end, often form colonies |
| Zooids | individual member of acolony of animals, such as colonial enidarians and ectoprocts |
| Medusa | a jellyfish, or the free-swimming stage in the life cycle of cnidarians |
| Pedal Laceration | asexual reproduction found in sea anemones, a form of fission |
| Protandrous | condition of hermaphroditic animals and plants in which male organs and their products appear before the corresponding female organs and their products, thus prebenting self-fertilization |
| Mesoglea | the layer of jellylike or cement material between the epidermis and gastrodermis in cnidarians and ctenophores; also may refer to jellylike matrix between epithelial layers in sponges |
| Diploblastic | organism with two germ layers, endoderm and ectoderm |
| Gastrovascular Cavity | body cavity in certain lower inverevrates that functions in both digestion and circulation and has a single opening serving as both mouth and anus |
| Strobilation | repeated, linear budding of individuals, as in scyphozoans (phylum Cndaria), or sets of reproductive organs, as in tapeworms (phylum Platyhelminthes) |
| Monoecious | having both male and female gonads in the same organism; hermaphroditic |
| Dioecious | having male and female organs in separate individuals |
| Planula Larva | free-swimming, ciliated larval type of cnidarians; usually flattened and ovoid, with an outer layer of ectodermal cells and an inner mass of endodermal cells |
| Gemmules | axsexual, cystlike reproductive unit in freshwater sponges; formed in summer or autumn and capable of overwintering |
| Parenchymula | in lower animals, a spongy mass of vacuolated mesenchyme cells filling spaces between viscera, muscles, or epithelia; in some, cell bodies of muscle cells- also the specialized tissue of an organ as distinguished from the supportring connective tissue |
| Cephalization | the process by which specialization, particularly of the sensory organs and appendages, become localized in the head end of animals |
| Scolex | the holdfast, or so-called head, of a tapeworm; bears suckers and , in some, hooks, and posterior to it new proglottids are differentiated |
| Proglottid | portion of a tapeworm containing a set of reproductive organs; usually corresponds to a segment |
| Cercaria | tadpolelike larva of trematodes (flukes) |
| Miracidium | a minute ciliated larval stage in the life of flukes |
| Sporocyst | a larval stage in the life cycle of flukes; it originates from a miracidium |
| Metacercaria | fluke juvenile (cercaria) that has lost its tail and has become encysted |
| Fission | asexual erproduction by a division of the body into two or more parts |
| Acoelomate | without a coelom, as in flatworms and proboscis worms |
| Triploblastic | pertaining to metazoa in which the embryo has three primary germ layers- ectoderm, mesoderm, and endoderm |
| Intermediate Host | a host in which some development of a symbiont occurs, but in which maturation and sexual reproduction do not take place |
| Definitive Host | the host in which sexual reproduction of a symbiont takes place; if no sexual reproduction, then the host in which the symbiont becomes mature and reproduces |
| Opisthaptor | posterior attachment organ of a monogenetic trematode |
| Onchomiracidium | a ciliated larva of a monogenetic trematode |
| Microfilariae | partially developed juveniles borme alive by filarial worms (phylum Nematoda) |
| Nurse Cells | single cells or layers of cells or structures for which the nurse cells provide nutrient or other molecules- for example, for insect oocytes or Trichinella spp. juveniles |
| Pseudocoel | a body cavity not lined with peritoneum and not a part of the blood or digestive systems, embryonically derived from the blastocoel |
| Coelom | the body cavity in triploblastic animals, lined with mesdermal peritoneum |
Created by:
jpclark
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