Biology 102Lecture 21Outline of Last lecture:I. FungiOutline of Current Lecture:I. Clicker QuestionII. Animal partsIII. SpongesClicker QuestionActive animals tend to have sense organs….a. Evenly spread out over the span of their bodies so they can sense their environment from all directionsb. Concentrated at the head region so that they can sense the environment from their anterior region as they move forwardc. Concentrated on their limbs since these are what contact the environment firstd. It varies so much from animal to animal that there isn’t really a general trend that fits foractive animals.Animal partsInvertebrates: have no backbone- Ex. Mimic octopusHow do we define an animal?- Eukaryotes- Multicellular- Heterotrophs- Lack cell walls- Diploid- Short lived gametes by meiosisProkaryotes: cell wall peptidoglycanFungi: cell wall chitinPlants: celluloseAnimals: lack a cell wallBiology 102- Cephalization- most active animals have sense at head region (anterior)- Radial- there’s no clear head with sensory organismo You cut it any way you get equal halves (from the central axis)- Bilateral- does have a head regiono Anterior: heado Posterior: tailo Most sensory organs are in the headSpongesNo body plan, no symmetry for any of these and no true issue- Sedentary- Suspension feeders (filter feeders) filter water and feed from particles in the water- Sessile: they can’t move or escape from predators Choanocytes: move flagella, trap food with mucousAmeobocytes: distribute food around sponge- Produce skeletal fibers (spongin)- All sponges have sponging, but not all have spiculeso Spicules: sharp, protective organ, defense
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