lecture_10_28_b_CrayPart1 - VI.B.1.a. Sequential...

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VI.B.1.a. Sequential coordinated contraction of different segments VI.B.2. Simplified view of escape : the contraction pathways Slow pathway Fast pathway There is a timing relationship between the fast and slow pathways. The fast pathway guarantees a short latency for the reflex to occur. The slow pathway kicks in right after the reflex begins and maximizes the strength of the escape response VI.B.1.a. Coordinated contraction of muscles moves the crayfish away from danger Once the escape response begins, it cannot be altered or stopped. The crayfish escape response habituates or is reduced when repetitive unimportant stimulation is applied. i) The crayfish uses large diameter, "giant" neurons to convey electrical signals rapidly. As a general rule, larger diameter neurons conduct action potentials more rapidly. The crayfish escape response is specialized for speed. ii) The crayfish uses electrical synapses to ensure quick initiation of the escape response (see below on the advantages and disadvantages of electrical synapses). Chemical transmission
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This note was uploaded on 11/16/2011 for the course NPB NPB 100 taught by Professor Campbell during the Spring '10 term at UC Davis.

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lecture_10_28_b_CrayPart1 - VI.B.1.a. Sequential...

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