Contraction of Skeletal Muscle (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why do skeletal muscles work in antagonistic pairs?
Why do skeletal muscles work in antagonistic pairs?
Muscles can only pull, not push
What defines the boundaries of a sarcomere?
What defines the boundaries of a sarcomere?
Z-lines
What happens to the A-band during muscle contraction?
What happens to the A-band during muscle contraction?
Remains the same width
What slides during the sliding filament mechanism?
What slides during the sliding filament mechanism?
Thick & thin filaments past each other
What is the role of tropomyosin in muscle contraction?
What is the role of tropomyosin in muscle contraction?
Blocks binding sites on actin
Which neurotransmitter is released at the neuromuscular junction?
Which neurotransmitter is released at the neuromuscular junction?
Acetylcholine
What does the sarcoplasmic reticulum store and release?
What does the sarcoplasmic reticulum store and release?
Calcium ions
How many times per second can the cross-bridge cycle repeat?
How many times per second can the cross-bridge cycle repeat?
Up to 100 times
What type of process is muscle relaxation?
What type of process is muscle relaxation?
Active process requiring ATP
How long does the phosphocreatine system last during maximum effort?
How long does the phosphocreatine system last during maximum effort?
About 10-15 seconds