BIO203H5 Lecture Notes - Central Nervous System, Oval Window, Outer Ear
Document Summary
Moths fly through the night sensory neurons will relay info about conditions in/out an animal to the to the cns. After integrating the info from many sensory neurons the cns sends signal to the muscle. Sensory receptors are located throughout the body and are categorized by the type of stimulus. Sensory stimulus (large enough) change in a sensors receptors membrane potential change in the firing of aps sent to the brain. For example, the amount of depolarization that occurs in a sound-receptor cell is proportional to the loudness of the sound. In verterbrates ion channels which respond to pressure are found in hair cells. Have many sterocilia( microvilli reinforced by actin filaments) and one kinocilium (true cilium with 9+2 arrangement of microtubules) If sterocilia bent in direction of kinocilium (above right figure), bending opens ion channels. If sterocilia other way then k+ channel will close, cell hyperpolarize, results in decrease in neurotransmitter released neuron less likely to trigger action potential.
