Cardiac Muscle Tetanus and Contractions Quiz
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Questions and Answers

Can cardiac muscle undergo tetanus?

  • Yes, but only under certain experimental conditions
  • No, it cannot undergo tetanus due to differences in muscle physiology (correct)
  • No, but it can exhibit sustained contraction under certain conditions
  • Yes, it can undergo tetanus just like skeletal muscle

What is the primary reason why cardiac muscle cannot undergo tetanus?

  • Lack of myosin and actin filaments
  • Lower energy production by mitochondria
  • Presence of a longer refractory period (correct)
  • Higher resistance to calcium ions

In what way does cardiac muscle differ from skeletal muscle regarding tetanus?

  • Skeletal muscle has a longer action potential duration
  • Cardiac muscle contracts more rapidly
  • Cardiac muscle has a higher myoglobin content
  • Skeletal muscle has a shorter refractory period (correct)

Under what circumstances can cardiac muscle exhibit sustained contraction?

<p>In response to electrical stimulation (D)</p> Signup and view all the answers

Can cardiac muscle exhibit sustained contraction due to tetanus?

<p>No, it lacks the ability to generate tetanic contractions (A)</p> Signup and view all the answers

What is the primary reason for the inability of cardiac muscle to undergo tetanus?

<p>Inherent refractory period of cardiac muscle cells (D)</p> Signup and view all the answers

How does cardiac muscle differ from skeletal muscle regarding tetanus?

<p>Cardiac muscle lacks the ability to generate tetanic contractions unlike skeletal muscle (C)</p> Signup and view all the answers

Under what circumstances can cardiac muscle exhibit continuous contraction?

<p>During pathological conditions such as heart failure (A)</p> Signup and view all the answers

Why is it not possible for cardiac muscle to undergo tetanus?

<p>Cardiac muscle has a longer refractory period compared to skeletal muscle. (B)</p> Signup and view all the answers

What is the primary reason for the inability of cardiac muscle to exhibit sustained contraction due to tetanus?

<p>Cardiac muscle has a lower myosin-ATPase activity compared to skeletal muscle. (A)</p> Signup and view all the answers

What distinguishes cardiac muscle from skeletal muscle regarding its susceptibility to tetanus?

<p>Cardiac muscle exhibits spontaneous depolarization, preventing the occurrence of tetanus. (C)</p> Signup and view all the answers

Under what circumstances can cardiac muscle exhibit continuous contraction?

<p>During sympathetic stimulation leading to an increase in calcium influx. (D)</p> Signup and view all the answers

Flashcards

Cardiac Muscle Tetanus?

Cardiac muscle cannot sustain contractions like skeletal muscle due to a longer refractory period, preventing tetanus.

Why no Tetanus?

The refractory period in cardiac muscle outlasts the contraction, preventing summation of contractions, thus no tetanus.

Cardiac vs. Skeletal Muscle Tetanus

Skeletal muscle has a shorter refractory period allowing repetitive stimulation, leading to tetanus. Cardiac muscle does not.

Cardiac Contraction without Tetanus

Cardiac muscle can exhibit sustained contraction in response to electrical stimulation, NOT due to tetanus.

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Inherent Refractory Period in Cardiac Muscle

Cardiac muscle cannot undergo tetanus because its inherent refractory period prevents summation of contractions.

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Cardiac Muscle vs. Skeletal Muscle Tetanus

Cardiac muscle cannot sustain contractions like skeletal muscle because it lacks the ability to generate tetanic contractions.

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Cardiac Contraction in Heart Failure

Cardiac muscle can exhibit continuous contraction during pathological conditions like heart failure.

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Why No Tetanus in Cardiac Muscle?

Cardiac muscle cannot undergo tetanus due to a longer refractory period compared to skeletal muscle.

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Myosin-ATPase Activity and Tetanus

The inability of cardiac muscle to exhibit sustained contraction due to tetanus is primarily because of lower myosin-ATPase activity compared to skeletal muscle.

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Spontaneous Depolarization in Cardiac Muscle

Cardiac muscle exhibits spontaneous depolarization, preventing the occurrence of tetanus, as opposed to skeletal muscle.

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Sympathetic Stimulation and Cardiac Contraction

Cardiac muscle can exhibit continuous contraction during sympathetic stimulation, increasing calcium influx.

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Cardiac Muscle Cell Refractory Period

The inherent refractory period of cardiac muscle cells is the primary reason for its inability to undergo tetanus.

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