muscles Flashcards
what makes up muscle fibre
myofibril
what makes up one myofibril
thick myosin filament (CROSS BRIDEGS)
thin actin filament
what happens when myosin filaments bind to ATP
it causes the cross bridges to detach from the actin filaments
what is tropomyosin
it partially covers the binding site
what is troponin
keeps the tropomyosin in place - COOPERATIVE BLOCK
what binds to troponin
what happens
calcium
troponin alters shape and pulls away tropomyosin
where is the calcium delease from
sarcoplasmic reticulum (lateral sac)
what is the force exerted by muscle
tension
force exerted on muscle
load
what is the result of repeated muscle stimulus
muscle fatigue
what happens when there is a muscle stmuuls
there is tetanus
what are the two types of muscle fibre
FAST and SLOW
what happens in fast muscle fibres
myosin has high ATPase activity
what happens in slow muscle fibres
has low ATPase activity
as the load increases…
the number of activacted motor units increases
