LSB258 Week 5

lsb258-week-5

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597504

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Describe two organs in the body where smooth muscle cells are located (1 mark). Briefly explain the function of smooth muscle cells and how the nervous system controls their activity (2 marks)

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597481

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What is the structure that connects muscles to bones?

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What is the long, fibrous molecule that extends over actin monomers and blocks the myosinbinding sites in muscles at rest?

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Which two sites of the myosin heads on the thick filament are used to generate a muscle's mechanical force?

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597484

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What is the name for the dark striation observed under the microscope that is due to the overlap of thick and thin filaments?

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What happens in the power stroke?

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597486

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What does calcium do to help the muscle contract?

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Which does NOT shorten when a muscle contracts?

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When a muscle participates in light exercise, in which order does it rely on energy sources?

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What are the properties of fast glycolytic muscle, which has less red blood vessels and mitochondria and dominates in white meat?

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What is a feature that makes cardiac muscle different from skeletal muscle?

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597491

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Which is NOT true of smooth muscle?

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597492

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The heart can relax completely and fill between contractions in part because summation is not possible. Why can't summation of cardiac muscle contractions occur?

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597493

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What factor accounts for the red appearance of slow twitch muscle fibres?

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597494

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Which is the correct order of events in the crossbridge cycle?

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