BIOL 2160 Chapter : Physio Chapter 12 Muscle Physiology
Document Summary
It is critical that you view the video before coming to class! 12. 31monitor tension : series-elastic component, non-contractile tendons and connective tissue, tendons first must be pulled tight, before the muscle, tendons, have elasticity, display, intra vs extrafusal fibers, extrafusal are , contractile cells of the, responsible for, innervated by. Muscle fibers extend length of muscle from tendon to tendon. Structure of a skeletal muscle fiber fig 12. 2. Orderly arrangement of thick and thin filaments: actin, myosin. Striations due to thick and thin filaments which run parallel to long axis. I band - light striations, thin filaments only, no overlap. Each g actin has a binding site for myosin. Complex of three proteins: attaches to actin, attaches to tropomyosin, binds calcium reversibly. Myosin head has 2 binding sites: for actin (actin binding site, for atp, atpase (nucleotide binding sites) Within a sarcomere during contraction: a band, i band, h zone, sarcomere.
