You Measure Levels of Ca²⁺ in Various Locations Within a Motor

question 72

Multiple Choice

You measure levels of Ca²⁺ in various locations within a motor neuron and a skeletal muscle fiber when the motor neuron is NOT depolarized, and the muscle fiber is at rest. Where do you expect to find high levels of Ca²⁺?

• A)binding to the receptors at the motor endplate of the muscle cell
• B)diffusing into the motor neuron through specialized channels in the plasma membrane
• C)within the T-tubules
• D)within the sarcoplasmic reticulum of the muscle fiber
• E)bound to troponin

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