Lesson 7.1.2
7.1.2 Sliding filament theory of muscle contraction Quiz: Pearson Edexcel Biology, Unit 7
20 questions
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Lesson 7.1.2, Sliding filament theory of muscle contraction: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 7: Run for your Life, written with Revision Ninja.
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The 20 questions
-
Which molecule binds to myosin to cause its detachment from actin?
- ADP
- Calcium ions
- ATP
- Troponin
-
What does calcium bind to in muscle myofibrils to trigger contraction?
- Myosin
- Troponin
- Actin
- Tropomyosin
-
Which band in the sarcomere remains constant in length during muscle contraction?
- H zone
- I band
- A band
- Z line
-
What happens to the myosin head during the power stroke?
- It unwinds
- It expands
- It pivots
- It detaches
-
What is the primary role of ATPase in muscle contraction?
- Binding calcium ions
- Hydrolysing ATP
- Transporting sodium ions
- Synthesising ATP
-
Which structure in a muscle fibre stores calcium ions?
- Sarcolemma
- T-tubules
- Sarcoplasmic reticulum
- Mitochondria
-
Muscle relaxation occurs when calcium ions are actively transported into which structure?
- T-tubules
- Myosin heads
- Sarcolemma
- Sarcoplasmic reticulum
-
Which protein forms the thick filaments inside a myofibril?
- Myosin
- Actin
- Tropomyosin
- Troponin
-
ATP binding to the myosin head is required for which process?
- Binding to actin
- Releasing calcium ions
- Shortening actin filaments
- Detaching from actin
-
What directly triggers calcium release from the sarcoplasmic reticulum?
- ATP hydrolysis
- Depolarisation of T-tubules
- Troponin binding
- Myosin pivoting
-
What happens if calcium cannot bind to troponin during muscle stimulation?
- Myosin heads detach
- Sarcomeres shorten completely
- Continuous muscle contraction
- Binding sites blocked
-
What is the main function of tropomyosin in a resting muscle fibre?
- Pumping calcium ions
- Blocking binding sites
- Anchoring myosin filaments
- Hydrolysing ATP
-
How many ATP molecules are hydrolysed per cross-bridge cycle?
- Two
- Zero
- One
- Three
-
During muscle contraction, what happens to the length of actin and myosin filaments?
- Doubles in length
- Lengthens slightly
- Shortens significantly
- Remains unchanged
-
Which structures mark the outer boundaries of a single sarcomere?
- M lines
- A bands
- H zones
- Z lines
-
Which event immediately follows the power stroke during cross-bridge cycling?
- Calcium release
- ADP synthesis
- ATP binds myosin
- Tropomyosin detachment
-
Cross-bridges form between myosin heads and which other structure?
- Actin binding sites
- T-tubules
- Z lines
- Sarcoplasmic reticulum
-
A sarcomere shortens from 2.4 μm to 1.8 μm during muscle contraction. What is the percentage shortening?
- 25%
- 33%
- 20%
- 75%
-
What happens to the H zone of a sarcomere during full muscle contraction?
- Narrows and disappears
- Widens significantly
- Remains unchanged
- Doubles in length
-
Which state occurs when myosin heads remain bound to actin due to a lack of ATP?
- Relaxed state
- Rigor state
- Power stroke state
- Resting state
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