Which Statement Is NOT True Regarding Cardiac Muscle

question 120

Multiple Choice

Which statement is NOT true regarding cardiac muscle?

• A) Cardiac muscle cells must obey the all-or-none law of contraction.
• B) Cardiac muscle cells rely on a sarcoplasmic reticulum for storage of Ca²⁺ ions.
• C) Calcium-induced calcium release is the process by which extracellular Ca²⁺ triggers the release of stored Ca²⁺ from the sarcoplasmic reticulum.
• D) Intercalated disks contain both desmosomes for firm attachment and gap junctions to allow communication.
• E) The oxygen demand of cardiac muscle cells is high because they have many mitochondria.

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