Lesson 3.6.3.1
3.6.3.1 Antagonistic muscles and the sliding filament mechanism Quiz: AQA Biology, Unit 6
20 questions
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Lesson 3.6.3.1, Antagonistic muscles and the sliding filament mechanism: 20 multiple choice questions for the AQA Biology (7402), Unit 6: Organisms respond to changes in their internal and external environments, written with Revision Ninja.
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The 20 questions
-
Why do skeletal muscles operate in antagonistic pairs?
- To share ATP demand
- Muscles only push
- Muscles only pull
- Muscles push and pull
-
Which protein forms the thick filaments of a myofibril?
- Actin
- Myosin
- Tropomyosin
- Phosphocreatine
-
What is the function of tropomyosin in resting skeletal muscle?
- Hydrolyses ATP
- Blocks binding sites
- Shortens sarcomeres
- Binds calcium ions
-
Which ion binds to troponin to initiate muscle contraction?
- Potassium ions
- Calcium ions
- Magnesium ions
- Sodium ions
-
What causes the detachment of the myosin head from actin?
- ATP hydrolysis
- Phosphate release
- Calcium uptake
- ATP binding
-
Which molecule rapidly regenerates ATP from ADP in active muscle?
- Lactic acid
- Phosphocreatine
- Myoglobin
- Glycogen
-
What defines the boundaries of a single sarcomere?
- Two Z-lines
- Two M-lines
- Two H-zones
- Two A-bands
-
Which sarcomere band remains unchanged in length during contraction?
- Z line
- H zone
- A band
- I band
-
What does the triceps muscle do when the biceps contracts to bend the arm?
- Relaxes
- Shortens
- Ossifies
- Contracts
-
What acts as an incompressible skeleton during earthworm locomotion?
- Fluid-filled coelom
- Chitin cuticle
- Cartilage rings
- Bony endoskeleton
-
What happens when calcium ion concentration inside a muscle fibre falls?
- ATP increases
- Muscle contracts
- Myosin hydrolyses
- Muscle relaxes
-
Why do muscles remain stiff in rigor mortis after death?
- Excess calcium ions
- No ATP for detachment
- No actin filaments
- High acetylcholine levels
-
A sarcomere is 2.0 micrometres long at rest and 1.6 micrometres when contracted. What is the percentage shortening?
- 25%
- 0.4%
- 80%
- 20%
-
What is the immediate result of ATP hydrolysis on a myosin head?
- Re-cocks the head
- Detaches from actin
- Executes power stroke
- Binds calcium ions
-
How do myofibrils shorten during contraction without filaments changing length?
- Myosin degrades
- Actin dissolves
- Filaments fold up
- Filaments slide past
-
Which ion is essential for muscle contraction because it moves tropomyosin?
- Sodium
- Hydrogen
- Calcium
- Chloride
-
Which energy source is used first at the start of vigorous exercise?
- Aerobic respiration
- Phosphocreatine store
- Lactic acid fermentation
- Fatty acid oxidation
-
What structural feature marks the ends of a sarcomere?
- H-zone
- Z-line
- A-band
- M-line
-
What happens to the H zone of a sarcomere during muscle contraction?
- Becomes narrower
- Disappears entirely
- Becomes wider
- Stays constant
-
How are sarcomeres arranged along a myofibril to shorten the muscle fibre?
- In parallel
- Random clusters
- In series
- Concentric rings
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