muscular system notes

sp med

voluntary

can control

involuntary

can’t control

cardiac muscle (4 things)

heart

uninucleotide

involuntary

branching

smooth muscle (4 things)

digestive system

uninucleotide

involuntary

spindle shape

skeletal muscle (4 things)

attach to bone (create movement)

multinucleotide

voluntary

long and skinny

flexion

decrease angle

extension

increase angle

abduction

taking away from body & increase angle

adduction

adding to body & decrease angle

rotation

circular motion

plantar flexion

point toes down (tippy toes)

dorsi flexion

point toes up at you

inversion

roll ankle in

eversion

roll ankle out

sprain

damage ligamant

strain

tendon or muscle (scale 1-3)

Sliding Filament Theory

= muscles contrast by microfilaments sliding together

how contract

uses ca+ (ions) and ATP

all or nothing principle

a muscle either FULLY contracts or does not contract at all

strenght of contraction

= determined by # of fibers recruited to contract

Lactic acid fermentation (3 things)

no ATP left but muscle still contracts

sits in our muscles = make us SORE

need to get it out

respiration

needed for ATP

myosin

thin

actin

thin

structure

actin & myosin → make

microfilaments → make

muscle fibers (biggest)