U1B of muscle tissue

structure/function

what are muscle fibres

bundles of long muscle cells

what are muscle cells membranes called

sarcolemma

what are muscle cell cytoplasm called

sarcoplasm

what do muscle cells contain

• more than 1 nucleus

• loads of mitochondria (to generate ATP)

what are myofibrils

enable muscle fibres to contract

what are the 2 types of myofilament

myosin and actin

what do titin filaments do?

helps keep thick filaments stable

what do fast twitch/slow twitch do?

influence how muscles respond during physical activity

3 factors of slow twitch muscle P1

• have dense capillary networks

• contain more myoglobin

• have less sarcoplasmic reticulum

2 other factors of slow twitch muscle P2

• more mitochondria for sustained contraction

• release ATP slowly by aerobic respiration

what are 3 factors of fast twitch (oxidative)

• many mitochondria

• more myoglobin

• many blood capillaries

what are 2 factors of fast twitch (oxidative)

• resistant to fatigue

• contact quickly

4 factors of fast twitch (glycolytic)

• contract rapidly

• few mitochondria

• less myoglobin

• few capillaries

2 factors of fast twitch (glycolytic)

• fatigue easily

• contain large concentration of glycogen