Question 1
Unit 5 style
Explain how the biceps and triceps muscles act as an antagonistic pair to move the forearm.
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Question 2
Unit 5 style
Which statement correctly describes tendons and ligaments?
- Tendons join bone to bone; ligaments join muscle to bone.
- Tendons join muscle to bone; ligaments join bone to bone.
- Tendons join muscle to muscle; ligaments join bone to bone.
- Tendons join muscle to bone; ligaments join muscle to muscle.
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Question 3
Unit 5 style
Describe the structure of a mammalian skeletal muscle fibre.
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Question 4
Unit 5 style
The table shows features of two samples of skeletal muscle, X and Y, each made mainly of one type of fibre. Deduce which sample is mainly slow twitch fibres, and explain how the features of each type of fibre suit its function.
| Feature | Muscle sample X | Muscle sample Y |
|---|---|---|
| Mitochondria | Many | Few |
| Myoglobin content | High | Low |
| Glycogen content | Low | High |
| Capillary density | High | Low |
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Question 5
Unit 5 style
Explain the roles of calcium ions, ATP, troponin and tropomyosin in the contraction of skeletal muscle.
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Question 6
Unit 5 style
A sarcomere in a relaxed muscle was 2.2 µm long. In the contracted muscle the length was 1.6 µm. Explain what happens to the lengths of the A band, the I band and the H zone as the muscle contracts.