Muscle Contraction and Sliding Filament Theory Quiz

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Questions and Answers

What is the role of calcium ions in muscle contraction?

  • Activate myosin cross bridges to attach to actin (correct)
  • Promote the breakdown of ATP in muscle cells
  • Prevent the sliding of myosin along the actin filaments
  • Inhibit myosin cross bridges from attaching to actin

What is the common reason for muscle fatigue?

  • Lack of actin-binding sites
  • High levels of calcium ions
  • Excess ATP production
  • Oxygen debt (correct)

What happens when a muscle is unable to contract even when stimulated?

  • Muscle fatigue (correct)
  • Reduced calcium ion levels
  • Enhanced actin-binding capacity
  • Excessive ATP production

How does accumulation of lactic acid affect muscle contraction?

<p>Increases acidity and reduces ATP production (A)</p> Signup and view all the answers

What is the role of acetylcholine (ACh) in muscle contraction?

<p>It opens sodium channels on the sarcolemma (C)</p> Signup and view all the answers

What happens at the peak of depolarization in the muscle cell?

<p>K+ gates fully open (D)</p> Signup and view all the answers

What causes hyperpolarization in the muscle cell?

<p>Potassium gates opening (D)</p> Signup and view all the answers

What is the function of the sodium-potassium pump in muscle cells?

<p>To pump sodium out of the cell and potassium into the cell (A)</p> Signup and view all the answers

What is the consequence of reaching the threshold potential (-55mV) in the muscle cell?

<p>Voltage-gated Na+ channels open, causing depolarization (A)</p> Signup and view all the answers

Flashcards

Role of Calcium Ions

Activate myosin cross bridges to attach to actin filaments.

Muscle Fatigue

A temporary condition where a muscle is unable to contract.

Lactic Acid Buildup

Increases acidity and reduces ATP production, impairing muscle function.

Acetylcholine (ACh) Role

Opens sodium channels on the sarcolemma, initiating depolarization.

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Peak Depolarization

K+ gates fully open, repolarizing the cell.

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Hyperpolarization Cause

Potassium gates opening, moving towards resting potential after depolarization.

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Sodium-Potassium Pump

To pump sodium out of the cell and potassium into the cell, maintaining the ion balance.

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Threshold Potential (-55mV)

Voltage-gated Na+ channels open, causing rapid depolarization.

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