Muscles and Movement (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Why are muscles arranged in antagonistic pairs?
Why are muscles arranged in antagonistic pairs?
Muscles can only contract, not extend
Which sarcomere regions narrow during muscle contraction?
Which sarcomere regions narrow during muscle contraction?
I band and H zone
What do calcium ions bind to during muscle contraction?
What do calcium ions bind to during muscle contraction?
Troponin
What happens when ATP binds to the myosin head?
What happens when ATP binds to the myosin head?
Myosin detaches from actin
What is a key feature of the creatine phosphate energy system?
What is a key feature of the creatine phosphate energy system?
It produces no lactate
How does a neuromuscular junction differ from a nerve synapse?
How does a neuromuscular junction differ from a nerve synapse?
One impulse always causes muscle contraction
What does the A band of a sarcomere contain?
What does the A band of a sarcomere contain?
Thick filaments including overlap with thin
What does myogenic mean in relation to cardiac muscle?
What does myogenic mean in relation to cardiac muscle?
Contracts without external stimulation
What happens when calcium binds to troponin?
What happens when calcium binds to troponin?
Tropomyosin is pulled away from binding sites
What enzyme function does the myosin head perform?
What enzyme function does the myosin head perform?
ATPase, hydrolyzing ATP to ADP and Pi