Chapter 9- types of fibers + muscle names

fibers vary by

speed, method of ATP, force generated + resistance to fatigue

types of fibers

muscles contain combo, one predominant, Slow Twitch, Fast Twitch IIb, Fast Twitch IIa

slow twitch

oxidative, reistant to fatigue, red fibers, abundant in myoglobin, blood, and mitochondria, slow ATPase activity, slow to contract, smaller in diameter

slow twitch exampled

postural of back + leg muscles

fast twitch IIb

glycolytic, fewer mitochondria, more SR, susceptible to fatigue, fast ATPase activity, contract rapidly, white fibers, less myoglobin, larger diameter, more force/tension

fast twitch IIb examples

hands + eyes, come arm + leg

fast twitch IIa

oxidative, least common, contract quickly, intermediate oxidative capacity + myoglobin, pink fibers, somewhat resistant to fatigue, rapid ATPase activity

muscles of body types

origin, insertion, agonist (primer mover), synergist, antagonist

origin

attachment to unmoving bone

insertion

attachment to moving bone

agonist

causes an action, does most work in movement

synergist

assist the primer mover

antagonist

work opposite one another to bring movement in direction against agonist

antagonist example

bicep to tricep

naming muscles

size, shape, direction of fibers, location, attachment, number of attachment, action

size

maximus, medius, minimus, longus, brevis, vastus

maximus

big

medial

medium size

minimus

small

longus

long

brevis

short

vastus

wide

shape

deltoid, trapezius, latissimus, teres

deltoid

triangle

trapezius

trapezoid

latissimus

broad

teres

rounded or cylindrical

direction of fibers

rectus, orbicularis, transverse, oblique

rectus

up and down

tansverse

side to side

orbicularis

in a circle

oblique

at an angle

location

frontalis, femoris, brachii

number of attachments

bicep, tricep, quadricep