Which of the Following Statements Is True Regarding Cardiac Muscle

question 52

Multiple Choice

Which of the following statements is true regarding cardiac muscle?

• A) Its main source of ATP production is glycogen.
• B) The actin and myosin myofilaments are not arranged in sarcomeres.
• C) Cardiac muscle preferentially metabolizes anaerobically.
• D) There are specialized gap junctions in cardiac muscle not found in skeletal or smooth muscles.
• E) Cardiac muscle goes into sustained contractions faster than skeletal muscle.

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Definitions:

DuPont Cellophane Case

The antitrust case brought against DuPont in which the U.S. Supreme Court ruled (in 1956) that while DuPont had a monopoly in the narrowly defined market for cellophane, it did not monopolize the more broadly defined market for flexible packaging materials. It was thus not guilty of violating the Sherman Act.

Microsoft Case

A 2002 antitrust case in which Microsoft was found guilty of violating the Sherman Act by engaging in a series of unlawful activities designed to maintain its monopoly in operating systems for personal computers; as a remedy the company was prohibited from engaging in a set of specific anticompetitive business practices.

DuPont Cellophane Case

A landmark antitrust case in which DuPont was accused of monopolistic practices in the cellophane market, highlighting issues of market dominance and competition.

Relevant Market

A market segment within which a particular product is sold, characterized by its competitiveness and substitutability.