BILD 2 Lecture Notes - Lecture 9: Tectorial Membrane, Basilar Membrane, Oval Window
17 Mar 2018
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Document Summary
Hearing, pressure wave enters through outer ear funnel > hits tympanic membrane & vibrates it, pushes against malleus > incus > stapes > oval window > cochlea, sound waves. Sound: pressure waves transmitted by particles in air or water. In vacuum, no sound transmittance: velocity of sound in air: 300m/s, velocity of light 300000000 m/s, velocity (v) = wavelength (lambda) x frequency (f) v = x f, 30hz bass: 3 * 10^2 = wavelength x 30hz. = 10m: air waves -> liquid waves. Troponin complex pulls tropomyosin filaments to expose the myosin binding sites on the actin: myosin binding sites exposed; muscle can contract. Calcium is then released from the sarco-plasmic reticulum: calcium ions released into the cytosol during excitation of skeletal muscle bind to the troponin complex. Degeneration of myelin sheaths in motor nerves: als: motor neuron degeneration, myastenia gravis - acetylcholine (ach) receptors not concentrated in synapse.
