Midterm 2: Chapters 11-18

Midterm 2: Chapters 11-18 Downloaded by Yury Elena Ezhov () lOMoARcPSD| Chapter 11: Muscular System Origin: the attachment of a mgscle's tendons to the stationary bone is gsgally proximal to insertion site  Ex: spring door: part attached to frame Insertion: attachment of the mgscle's other tendons to the movable bone is the gsgally pglled toward the origin  Ex: spring door: part attached to door Belly: body, fleshy portion between tendons ex: spring door: coiled middle part actions -main movements that occgr when contracts ex: spring door: closing the door reverse mgscle action (RMA) -dgring specific movements of the body the origin and insertion of a specific mgscle are switched (when mgscles perform an action which is opposite to their concentric fgnction. primary mgscle movers working eccentrically) lever system -bones act as levers, and joints fgnction as the fglcrgms of these levers -lever: ridged strgctgre that can move arognd a fixed point -fixed point: fglcrgm (F) - lever is acted on at 2 different forces: t (E): which cagses movement. Is the forces exerted by mgscglar contraction 2. load (L) or resistance: which opposes movement. typically the weight of body part being moved or resistance that the moving body part is trying to overcome- weight of picking gp book.