The diagram below shows a transmission electron micrograph of a section of skeletal muscle.
Name structures A, Band C
During intense exercise, the pH of the skeletal muscle tissue falls sharply. This decrease in pH reduces the ability of calcium ions to stimulate muscle contraction.
Describe how.
The sliding filament mechanism of a muscle contraction is used to describe how muscle fibers contract and relax.
Which statements about the role of ATP are true?
- ATP binds to the myosin heads producing a change in the shape that causes the myosin heads to release from the action filaments
- ATP binds to the myosin heads producing a change in shape that causes the myosin heads to bind to the actin filaments
- Calcium ions activate the enzyme ATPase which hydrolyses ATP to ADP
- Potassium ions activate the enzyme ATPase which hydrolyses ATP to ADP
☐ | A | I and IV | |
☐ | B | II and III | |
☐ | C | I and III | |
☐ | D | II and IV |
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