BIO325H5 Lecture Notes - Lecture 1: Heredity, Pleiotropy, Handfish
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Forms and forces/biomechanics
D’Arcy and Thompson:
Compression and Tension: from Trabeculae to dynamic opmizaon
Bone as material; what is trabecula?
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Numida meleagris Linnaeus, 1766
Dynamic opmizaon in bone
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D"arcy and thompson: biomechanics is the study of forces in organisms: gives us insight on their form as well. Ennos: how adaptions are constrained by animal or plant movement. Biomechanics: evolution of form by selection constrained by physics. Compression and tension: from trabeculae to dynamic optimization. An apple has a stalk (the little wood bit) that pushes from the center up and then gravity pushing it down: boom compression: relates to newton"s third law of grav (every action has an opp. Bone is a composite material made of a whole bunch working together: extracellular material, matrix of collagen with calcium salts, tissue laid down in embryo by use of fibroblasts and osteocytes. Bone is dynamic: this is why astronauts lose bone density and gain it when they"re back. The trabecula is the forming bones that eventually come together to make the cancellous bone.