Muscular System Pt 3

Fiber Architecture Parallel: fibers run parallel to each other; less powerful; muscle can shorten better; moves body segments through large ranges of motion EX: Biceps brachii, rectus abdominis, Pectoralis major

Fiber Architecture Pinnate: fibers attach obliquely to a central tendon; generates more force because you can pack more fibers into the muscle; does not shorten as much ex: Rectus femoris, Deltoid

Muscle Strength, Power and Endurance

Strength Amount of weight being lifted is an indirect measure of strength More precisely – the amount of torque (rotary force) muscles can generate Torque = product of size of force abd the perpendicular distance of that force from an axis of rotation T= F m xd F

Power Related to force and velocity Muscle force multiplied by muscle shortening velocity Sprinter with greatest leg strength may not be the fastest

Endurance Ability of a muscle to produce tension over a period of time Usually the longer the physical activity is maintained, the greater the endurance Definition is specific to activity (gymnast, rower, etc.) The faster a muscle fatigues, the less endurance it has