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Transcript
Sensory Mechanism Marie Černá Five categories • Mechanoreceptors - muscle spindle - hair cell in ear • Pain receptors (nociceptors) • Thermoreceptors • Chemoreceptors - gustatory (taste) - olfactory (smell) • Electromagnetic receptors - photoreceptors Structure of the eye Retina Photoreceptors Neurons Cells of Retina The effect of light on retinal Focusing in the eye Structure of the ear Structure of the ear A cross-sectional view of the cochlea with three canals Mechanoreceptors Mechanism of hearing Semicircular canals Cochlea Vibrations, caused by sound waves, in the tympanic membrane are conducted via 3 small bones to the oval window and create pressure waves in the cochlear fluid perilymph. The waves pass through the vestibular canal to the apex of the cochlea, then back toward the base of the cochlea via the tympanic canal and end on the round window. As the basilar membrane vibrates, hair cells repeatedly brush against the tectorial membrane. This stimulus causes hair cells to depolarize. Perilymph Organs of balance A vestibule contains two chambers: the utricle and saccule Gustatory chemoreceptors Olfactory chemoreceptors Nociceptors + Thermoreceptors Literature Biology, eighth edition, Campbell, Reece Unit seven: Animal Form and Function Chapter 50: Sensory and Motor Mechanisms Concept 50.1, 50.2, 50.3, 50.4 Pages 1087 – 1105