Structure of skeletal muscle Flashcards
What is the thin filament known as?
Actin
What is the thick filament known as?
Myosin
What are myofibrils made up of?
Thin and thick filment
What is the light band called?
The I band
Why is the light band called the light band?
Light colour as thin and thick filaments do not overlap
What is the name for the dark band?
A bands
What is the name of the light coloured region in the centre of the A band?
H zone
What is the line called at the centre of the I band?
Z line
What are the 2 types of muscle fibres?
Slow twitch
Fast twitch
What adaptations do slow twitch muscle fibres have for their role?
Large myoglobin store
Rich supply of blood vessels
Numerous mitochondria
What adaptations do fast twitch muscle fibres have for their role?
Thicker and more numerous myosin filaments
Higher conc of glycogen
High conc of anaerobic enzymes
Phosphocreatine store
What is a neuromuscular junction?
Point where the motor neurone meets the skeletal muscle fibre
How is a neuromuscular junction and a synapse similar?
Both have neurotransmitters
Use Na+/K+ pump to re-polarise axon
Use enzymes to break down neurotransmitter
