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Lecture 9-development and hormones

Aggressive crowing normal yes yes normal small no no

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Unformatted text preview: rmal Yes Yes Normal Early evidence for testosterone • Castrated animals were weak and lacked male characteristics • Animals with implanted testis developed normally Group 1 Appearance of immature roosters Group 2 Group 3 Manipulation None Remove testes Remove testes and reimplant one in abdomen Appearance of adult roosters Comb and wattles: Mount hens? Aggressive? Crowing? Normal Yes Yes Normal Small No No Weak Normal Yes Yes Normal Types of Chemical Communication Synaptic • Synaptic communication- chemical released by one neuron to act on another one (a)ÑSynaptic transmission function Neuron (b)ÑAutocrine function (c)ÑParacrine function Paracrine cell Autocrine (a)ÑSynaptic transmission function Types of Chemical Communication Autocrine • Autocrine communication- hormone released by a cell which then affects its own activity cell Paracrine • Paracrine communication- hormone released by Neuron a cell to affect nearby target cells cell (b)ÑAutocrine function (c)ÑParacrine function Paracrine cell Autocrine cell Types of Chemical Communication Postsynaptic neuron Presynaptic neuron Neurotransmitter Endocrine • Endocrine communication- hormone released (b) Signal molecule into bloodstream to act on distal target tissues into Blood Endocrine cell Target cell Hormone (c) Neuron Target cell Blood Types of Chemical Communication • Pheromones hormonal signaling from one individual to another urine marking • Allomones hormonal signaling between species predator odors Principles of Hormone Action (pages 123, 126­7) 1) • 1) Slow, gradual action that outlasts hormonal signal signal 2) • 2) Changes intensity or probability of behavior, rather than turning behavior on or off rather 3) •...
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