Action Potentials in Contractile Cardiac Muscle Cells

question 59

Multiple Choice

Action potentials in contractile cardiac muscle cells

• A) are much faster than action potentials in skeletal muscle.
• B) have no plateau phase.
• C) involve voltage-gated calcium ion channels.
• D) have sodium ion channels that open and cause repolarization.
• E) have all of these characteristics.

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Definitions:

Bleach

A chemical compound used to whiten or remove color through oxidation or reduction, often used for disinfection and stain removal.

Seawater

Water from the sea, which is saline in nature due to the presence of dissolved salts, minerals, and other substances.

Muscle Contraction

The process where muscle fibers shorten or tense, producing movement or force, often in response to a nerve impulse.

Sodium Ions

Positively charged ions of sodium, vital for cellular processes, including generating electrical signals in neurons.