An Autorhythmic Heart Cell Is One in Which

question 15

Multiple Choice

An autorhythmic heart cell is one in which

• A)action potentials fire spontaneoulsy.
• B)action potentials are stimulated by internal stores of acetylcholine.
• C)action potentials always occur at exactly the same frequency.
• D)all filaments contract and relax with a high degree of synchrony.
• E)action potentials are initiated by the autonomic nervous system.

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Definitions:

Lock-up Clutch

A mechanism used in automatic transmissions that locks the engine directly to the transmission's output, improving fuel efficiency and performance.

Overrunning Clutch

A drive-protection mechanism that prevents a drive member from being driven; for instance, after a starter motor has started the engine, the overrunning clutch prevents the engine from driving the starter and damaging it.

Flex Plate

A metal disc that connects the engine to the torque converter in automatic transmissions, allowing power transfer.

Driven Member

A component in a mechanical system that receives motion or power from another component, rather than generating it.