BIO325H5 Lecture Notes - Lecture 7: Compressive Stress, Anatomical Terms Of Location, Arthropod Leg
Document Summary
Myogenic muscle contractions and recoil elasticity, after the radial stop rests on the pwp, the base of the scrpries the first axillary up upon the parascutal shelf (diagram c). This lifts the scutuma very small bit which stretches the tergosternals slightly, stimulating their contraction. These flight muscles are fibrillar rand myogenic (not neurogenic), --so these antagonists work back and forth to stimulate each other"s contraction --without any motor neuron activity needed once started. This flying machine is so designed that the contraction of one antagonist power muscle slightly stretches and triggers the other: three hundred wing strokesper second is not high among mosquitoes. [euler was an 18thcentury mathematician who first analyzed this. ] (ennos, chapt. 9: what happens is that because no strut is ever exactly straight, the compressive force will always act to one side of its centre, setting up a bending moment on the strut. This force will tend to bend it further outward so increasing the bending moment.
