Which Muscles Are Included in the Erector Spinae Group

question 56

Multiple Choice

Which muscles are included in the erector spinae group?

• A) Masseter, pterygoids, and temporalis
• B) Spinalis, longissimus, and iliocostalis
• C) Semispinalis, rotatores, and multifidus
• D) Infraspinatus, supraspinatus, and teres minor

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Definitions:

MC > MR

A condition where the marginal cost of producing an additional unit is greater than the marginal revenue earned from selling it, suggesting a decrease in production might increase profit.

Profit

The financial gain realized when the amount of revenue gained from a business activity exceeds the expenses, costs, and taxes needed to sustain the activity.

MC = MR

This abbreviation stands for the equality of marginal cost (MC) and marginal revenue (MR), a condition for profit maximization in perfectly competitive markets.

Profit

The profit achieved when the income from business operations surpasses all associated expenses, costs, and taxes.