BIOL BC 1500x Chapter Notes - Chapter 31.1-31.3: Symmetry In Biology, Body Cavity, Parazoa
9 Sep 2016
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Food is ingested, digested, and absorbed using oxygen and stored in glycogen, oil, and fat motile: can move at some point in life (most motile in adult stage) sessile: anchored in place, stationary sensory and nervous systems. Reproduce sexually or asexually sexual reproduction gametes: haploid cells, eggs and sperm cells zygotes: fertilized eggs, fused gametes. Zygote undergoes mitosis, becomes embryo, which develops into immature larva larva becomes adult, can reproduce. Common ancestor was probably a colonial chonao agellate protist. Sponges collar cells are identical to present day choano agellates. Tissues: similar cells that work together to perform a function parazoa: sponges, no tissues eumetazoa: everything else, tissues. Primary cell layers: ectoderm, mesoderm, and endoderm endoderm: lines digestive tract and sometimes respiratory system ectoderm: (skin) body covering and nervous system mesoderm: muscles, structures between skin and digestive tract. Radiata: cnidarians and ctenopohrans, slow movement or sessile, nervous system looks like a net.
