BIO271H1 Lecture : Lecture 5
Document Summary
Sensory physiology: photoreception: cross section in the cochlea, outer hairs amplify quiet sound. the change in the shape of the hair cell increases the movement of the basilar membrane increased stimulus to inner hair cells. Inhibited by efferent neurons in response to loud sounds: cristae detect angular acceleration, photoreception, ability to detect small proportion of the electromagnetic wave: from near infared to near uv. a small proportion of the electromagnetic spectrum from ultraviolet to near infared. ciliary photoreceptors: have a single, highly folded cilium, folds form disks that contain photopigments. rhabdomeric photoreceptors: apical surface covered with multiple outfoldings called microvillar projections, microvillar projections contain photopigments, photopigments. molecules that absorb energy from photons: phylogeny of photoreceptors, vertebrates have ciliary receptors, but other chordata have both www. notesolution. com, don"t have to know details of evolutionary tree, vertebrate photoreceptors, have ciliary photoreceptors. properties depend on its photopigment: photopigments, have two covalently bonded parts.
