slow and fast twitch fibres

Question 1

what are slow twitch fibres

Answer 1

found in muscles used for posture such as back and neck

Question 2

what are fast twitch fibres

Answer 2

found mainly in muscles such as arms and legs

Question 3

how are slow twitch fibres adapted to function

Answer 3

-slow movement over long period of time
-muscle fibres are long and thin
-muscles fatigue slowly and contract slowly

Question 4

how are fast twitch fibres adapted to function

Answer 4

-fast or strong movement over time
-muscle fibres are short and wide
-muscles fatigue and contract quickly

Question 5

what is the slow twitch fibres energy source

Answer 5

rely on energy through aerobic respiration

Question 6

what is the fast twitch fibres energy source

Answer 6

rely on energy released through anaerobic respiration

Question 7

slow twitch fibres cell structure

Answer 7

-lots of mitochondria to maintain aerobic respiration
-lots of capillaries to supply muscle fibres with oxygen
-low levels of glycogen and phosphocreatine
-large stores of myoglobin

Question 8

fast twitch fibres cell structure

Answer 8

-fewer mitochondria
-fewer capillaries
-higher levels of glycogen and phosphocreatine
-small stores of myoglobin