effects of stuff on fibers

Question 1

effects of muscle structure on force

Answer 1

force a muscle can exert is proportional to its physiological cross section (more muscle are, more actin and myosin)
-pennate can exert more than longitudinal of same size

Question 2

effect of muscle structure on ROM

Answer 2

long muscles with fibers longitudinally arranged can exert force over a longer distance
-pennate can exert a large force but only over a short range

Question 3

Henneman’s size principle

Answer 3

as more force is needed, motor units are recruited in precise order according to the magnitude of their force output
-minimizes the amt of fatigue an organism experiences

Question 4

effect of age on fiber types

Answer 4

progressive loss of type II motor units and muscle fibers

Question 5

effects of obesity

Answer 5

lower proportions of type IIB fibers are found in obese than in non-obese
-Lipotoxicity: fat infiltrates the muscle cell and why we think fast twitch is lost in obesity