KINESIOL 1A03 Lecture Notes - Endoplasmic Reticulum, Myocyte, Capillary
Document Summary
Body movement b/c attached to bone: exception muscle attached to sclera of eye, skin in face. Maintenance of posture: protect and stabilize joints, maintain various body positions standing, sitting, muscles that maintain postures are always contracting. Respiration diaphragm, intercostals muscles help us breathe. Communication wouldn"t be able to write, speak, facial expression. Contractility: ability of a muscle to shorten forcefully: muscle attached to 2 bones, when shortened, pulls on 2 bones, creates tension which causes muscle to move bone. Extensibility: muscle can be stretched beyond its resting length and still be able to contract: normal resting position is anatomical position but can stretch muscles beyond normal resting position and still generate a force. Elasticity: ability of muscle to recoil to original resting length after its been stretched. Muscle tissue can only ever be contracted or not, cannot be inhibited gravity has to take over and relax muscle, or opposing muscle group contracts while other relaxes.