What Explains Why There Is a Threshold Depolarization of About

question 37

Multiple Choice

What explains why there is a threshold depolarization of about 45 mV above resting membrane potential before any transmitter release occurs?

• A) This is the magnitude of depolarization required to activate presynaptic voltage gated sodium channels.
• B) This is the magnitude of depolarization required to activate presynaptic voltage gated potassium channels.
• C) This is the magnitude of depolarization required to activate a presynaptic action potential.
• D) This is the magnitude of depolarization required to activate presynaptic voltage-gated calcium channels.
• E) This is the magnitude of depolarization required to activate a postsynaptic action potential.