BIOL 111 Lecture Notes - Lecture 9: Hydrostatic Skeleton, Multicellular Organism, Desmosome

• School: McGill University
• Department: Biology
• Course: BIOL 111
• Professor: Rudiger Krahe

Document Summary

Biol 111 lecture 9 introduction to animals: sponges. Lecture date/time: oct 8th, 2015 / 10:35-11:25 am. Eukaryotic: have a nucleus, have membrane-bound organelles. Heterotrophic: need to feed on many different materials, they use pre-formed organic materials as energy and a carbon source. Modes of feeding: predators, herbivores, filter feeders, parasites, detritivores, omnivores, etc. Most animals have internal digestion they use internal processes to break down food (versus fungi that rely on external digestion) Most have an internal gut that is continuous with the outside environment and permits internal digestion of food items. No cell walls: types of structural support: Hydrostatic skeleton: muscles contract against fluid-filled cavity, ex. earthworm. Exoskeleton: external, non living covering that does not grow in size, so to grow they moult = shed hard outer covering; moulting animals = ecdysozoans . Endoskeleton: (ex. human) internal support, vertebrates have living tissue (they grow with you) , some invertebrates (non-living, have caco3)