9 Questions
What is the role of calcium ions in muscle contraction?
Activate myosin cross bridges to attach to actin
What is the common reason for muscle fatigue?
Oxygen debt
What happens when a muscle is unable to contract even when stimulated?
Muscle fatigue
How does accumulation of lactic acid affect muscle contraction?
Increases acidity and reduces ATP production
What is the role of acetylcholine (ACh) in muscle contraction?
It opens sodium channels on the sarcolemma
What happens at the peak of depolarization in the muscle cell?
K+ gates fully open
What causes hyperpolarization in the muscle cell?
Potassium gates opening
What is the function of the sodium-potassium pump in muscle cells?
To pump sodium out of the cell and potassium into the cell
What is the consequence of reaching the threshold potential (-55mV) in the muscle cell?
Voltage-gated Na+ channels open, causing depolarization
Test your knowledge on muscle contraction and the sliding filament theory with this quiz. Learn about the role of nerve activation, ATP, myosin, actin, and calcium ions in the process of muscle contraction.
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