The Role of Ca²⁺ in the Control of Muscle Contraction

question 1

Multiple Choice

The role of Ca²⁺ in the control of muscle contraction is to

• A) cause depolarization of the T tubule system.
• B) initiate changes in protein conformation that expose myosin-binding sites on actin.
• C) change the conformation of myosin heads,thus causing microfilaments to slide past each other.
• D) bind to tropomyosin and break actin-myosin cross-bridges.
• E) block the ATP-binding site on myosin heads,enabling muscles to relax.

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Definitions:

Markup Percentage

The proportion of the cost of goods that is added to cover the overhead and profit, which sets the selling price.

Variable Cost

Costs that change in proportion to the level of production or sales activity, such as raw materials and direct labor.

Markup Percentage

The percentage added to the cost of goods to cover overhead and profit when setting the selling price.

Total Cost

The complete expense incurred in producing a product or delivering a service, including both fixed and variable costs.