BVB301 Lecture 13: BVB301 Week 13
Document Summary
Movement = nervous signals enacting highly coordinated contraction of muscles that are anchored to bones, often by tendons. Skeletal muscles: attached to bones by tendons, cross joints so when they contract, bones they attach to move. Found on organ walls: have contractile fibres, but lack the orderly striations of skeletal muscle, contractions produce movement of organ contents, peristalsis. Sarcoplasm is like cytoplasm, but lots of glycogen and myoglobin. Cardiac muscle: produces atrial and ventricular contractions, pumping blood. I(cid:374)flue(cid:374)(cid:272)ed (cid:271)y (cid:374)er(cid:448)es a(cid:374)d hor(cid:373)o(cid:374)es, (cid:271)ut has (cid:862)ele(cid:272)tri(cid:272)al(cid:863) syste(cid:373) of its o(cid:449)(cid:374) to i(cid:374)itiate a(cid:374)d coordinate contractions: cells jointed at intercalated disks, to work as single functional unit or syncytium. Match it to the filaments and the sarcomere length below is distance between the dark lines around the myofibril above those lines are the z lines. Also note below, the titin filament it is a molecular spring with passive elasticity from the z discs to the m line.
