Muscles and Movement (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Antagonistic pairs
Antagonistic pairs
Muscles arranged in opposing pairs
Why muscles need antagonistic pairs
Why muscles need antagonistic pairs
Muscles can only contract, cannot push/extend themselves
Sarcomere
Sarcomere
Repeating contractile unit bounded by Z lines
Thick filaments composed of
Thick filaments composed of
Myosin protein
Tropomyosin role in relaxed muscle
Tropomyosin role in relaxed muscle
Blocks myosin-binding sites on actin
What binds to troponin to trigger contraction
What binds to troponin to trigger contraction
Calcium ions
Bands that narrow during muscle contraction
Bands that narrow during muscle contraction
I band and H zone
ATP role in contraction cycle
ATP role in contraction cycle
Causes myosin head detachment from actin
Creatine phosphate function
Creatine phosphate function
Rapidly donates phosphate to convert ADP to ATP
Neurotransmitter at neuromuscular junction
Neurotransmitter at neuromuscular junction
Acetylcholine