3.8 PEx: Neurophysiology of Nerve Impulses part 2

Part A
At a chemical synapse, the intensity of the stimulus is coded by _______.
    the amount of neurotransmitter released and the amount of calcium that enters the axon terminal
    the size of the action potential
    the amount of neurotransmitter released
    the amount of calcium that enters the axon terminal
    the size of the action potential and the amount of neurotransmitter released

Part B

When the calcium was removed from the extracellular solution, _______.
    the amount of neurotransmitter released decreased
    no neurotransmitter was released
    the amount of neurotransmitter released increased
    the amount of neurotransmitter released did not change

Part C

When magnesium was added to the extracellular solution, _______.
    the amount of neurotransmitter released did not change
    the amount of neurotransmitter released decreased
    no neurotransmitter was released
    the amount of neurotransmitter released increased

Part D

Calcium and magnesium are both _______.
    monovalent anions
    divalent cations
    divalent anions
    monovalent cations