What Happens During a Cross-Bridge Cycle in Skeletal Muscle

question 136

Multiple Choice

What happens during a cross-bridge cycle in skeletal muscle?

• A) The cross bridge is energized as myosin ATPase activity hydrolyzes ATP.
• B) The myosin cross bridge is able to bind with troponin molecule when Ca²⁺ pulls the troponin-tropomyosin complex aside.
• C) The linkage between actin and the myosin cross bridge is broken at the end of the cross-bridge cycle as Mg²⁺ binds to the cross bridge.
• D) The power strokes of all cross bridges are directed toward the periphery of the thick filament.

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Definitions:

Fixed Proportions Technology

Fixed proportions technology is a production process where inputs must be used in strict, fixed ratios to produce outputs, with no possibility of substitution between inputs.

Pollution

The presence of substances in the environment that are harmful to human health, natural ecosystems, or the climate.

Output

The total amount of products or services produced by a company, industry, or economy.

Marginal External Costs

The additional cost imposed on third parties not involved in a transaction or decision, for each additional unit produced or consumed.