BIOL 202 Lecture Notes - Lecture 11: Amphioctopus Marginatus, Chromatophore, Photophore

• School: Queen's University
• Department: Biology
• Course: BIOL 202
• Professor: William Nelson

Document Summary

Lecture 11 nervous system and sensory organs. Coconut octopus: grabs coconut shells and other things in the ocean to hide and camouflage itself interneurons: One thing that is different from between invert and vert, is that i(cid:374)(cid:448)ert do(cid:374)"t ha(cid:448)e a (cid:373)yli(cid:374) sheeth . Without a (cid:373)yli(cid:374) sheeth the signal does not travel as fast. In cephalopods there is an innovation to this prob: thick nerves to get faster never pulses. What nerve cells are causing this: chromatophore; muscle neuron, the expansion and contraction of an, photophore; sensory neuron, chromatophore; sensory neuron, chemophore; interneuron, choanocyte; muscle neuron. Animals without tissues still have coordinated reaction to stimuli: po(cid:374)ges do(cid:374)"t ha(cid:448)e a (cid:374)er(cid:448)ous syste(cid:373) (cid:271)ut they do ha(cid:448)e a (cid:272)oordi(cid:374)ati(cid:374)g it"s (cid:272)ell movement (cid:862)s(cid:374)eezi(cid:374)g(cid:863) spo(cid:374)ges. Cells that do(cid:374)"t have any other way of connecting to the other. How do they do this: calcium chemical signals (calcium waves go across the animal that cause it to contract)