Lesson 7.1.3
7.1.3 Muscle fibre structure, fast and slow twitch fibres Quiz: Pearson Edexcel Biology, Unit 7
20 questions
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Lesson 7.1.3, Muscle fibre structure, fast and slow twitch fibres: 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
-
What type of cell structure is a skeletal muscle fibre?
- Single-nucleate cell
- Multinucleate cell
- Biconcave cell
- Anucleate cell
-
Which muscle fibre type contains a higher density of mitochondria and myoglobin?
- Slow twitch
- Cardiac muscle
- Smooth muscle
- Fast twitch
-
Which energy store is found in high concentration within fast twitch muscle fibres?
- Myoglobin
- Glycogen
- Haemoglobin
- Starch
-
How do fast-twitch muscle fibres contract and fatigue compared to slow-twitch?
- Slower, slower
- Faster, faster
- Faster, slower
- Slower, faster
-
Which pigment is primarily responsible for the deep red colour of slow twitch muscle fibres?
- Haemoglobin
- Myoglobin
- Cytochrome
- Melanin
-
Which structures conduct action potentials deep into the centre of a muscle fibre?
- T-tubules
- Myofibrils
- Sarcoplasmic reticulum
- Z-lines
-
Which organelle in fast twitch muscle fibres provides rapid release and storage of calcium ions?
- Mitochondria
- Golgi apparatus
- Lysosomes
- Sarcoplasmic reticulum
-
Which muscle fibre type predominates in the leg muscles of successful marathon runners?
- Fast twitch
- Cardiac muscle
- Slow twitch
- Smooth muscle
-
Which main metabolic pathway provides ATP in fast twitch fibres during a 100 m sprint?
- Aerobic respiration
- Anaerobic respiration
- Krebs cycle
- Oxidative phosphorylation
-
A muscle fibre with abundant capillaries and many mitochondria is adapted for which process?
- Creatine phosphate breakdown
- Aerobic respiration
- Anaerobic glycolysis
- Lactic acid fermentation
-
Why is a high proportion of fast twitch fibres unsuitable for long distance running?
- They store oxygen
- They produce heat
- They fatigue quickly
- They contract slowly
-
How does the proportion of fast-twitch muscle fibres vary among humans?
- Identical in all
- Varies between individuals
- Fixed at fifty percent
- Depends on diet
-
Why do slow twitch muscle fibres have a dense capillary supply?
- To hydrolyse ATP
- To remove glucose
- To supply oxygen
- To store glycogen
-
What is the main function of myoglobin in muscle fibres?
- Transporting glucose
- Synthesising ATP
- Storing oxygen
- Hydrolysing ATP
-
Which structural feature is present in both fast and slow twitch fibres?
- Many mitochondria
- High capillary density
- Sarcomeres
- High myoglobin content
-
Which carbohydrate store is abundant in fast twitch muscle fibres?
- Glycogen
- Starch
- Glucose
- Lactate
-
Which muscle fibre type has high myosin ATPase activity and fatigues quickly?
- Fast twitch
- Slow twitch
- Smooth
- Cardiac
-
A slow fibre has 400 mitochondria and a fast fibre has 100. Calculate the ratio.
- 4 to 1
- 5 to 1
- 3 to 1
- 2 to 1
-
How does endurance training alter the properties of slow twitch muscle fibres?
- Decreases myoglobin content
- Decreases capillary density
- Increases lactate production
- Increases mitochondrial density
-
Which feature allows slow twitch fibres to sustain contraction for long periods?
- High lactate tolerance
- High glycogen content
- Rapid ATP hydrolysis
- High mitochondrial density
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