ATP Use Is Lower in Smooth Muscle Than in Skeletal

question 29

Multiple Choice

ATP use is lower in smooth muscle than in skeletal muscle in part because

• A) there is no sarcoplasmic reticulum calcium ATPase in smooth muscle.
• B) smooth muscle myosin does not require an ATP molecule for each cross-bridge cycle.
• C) smooth muscle myosin completes the cross-bridge cycle more slowly than skeletal muscle myosin does.
• D) calcium removal from the cytoplasm does not require ATP in smooth muscle.

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Definitions:

Indirect Method

A method often used in cash flow statements to convert net income into net cash flow from operating activities by adjusting for non-cash transactions and changes in working capital.

Net Income

The total profit of a company after all expenses and taxes have been deducted from revenue, also known as net earnings or net profit.

Noncash Expense

Expenses that do not directly result in a physical outflow of cash but are recorded in the accounting records, such as depreciation.

Depreciation

The methodical distribution of the expense of a physical asset across its lifespan.