ANSWERS ARE HIGHLIGHTED
1.A synaptic cleft, or synaptic gap, can be found between a neuron and ______.
All of these. a gland.
a muscle cell.
another neuron.
2. The membrane potential that occurs when neurotransmitters bind to their receptors is called _______.
a postsynaptic potential a receptor potential
an action potential
an action potential and a receptor
3. The release of neurotransmitter occurs _______.
all along the axon
at the axon terminal from the motor endplate
4. Which of the following occurs first?
Voltage-gated calcium channels are opened.
Synaptic vesicles exit by exocytosis.
Extracellular calcium enters the axon terminal.
An action potential arrives at the axon terminal.5. At a chemical synapse, the intensity of the stimulus is coded by _______.
the amount of neurotransmitter released
the amount of calcium that enters the axon terminal
the size of the action potential
the size of the action potential and the amount of neurotransmitter released
the amount of neurotransmitter released and the amount of calcium that enters the axon terminal6. When the calcium was removed from the extracellular solution, _______.
the amount of neurotransmitter released increased
no neurotransmitter was released the amount of neurotransmitter released did not change
the amount of neurotransmitter released decreased
7.When magnesium was added to the extracellular solution, _______.
the amount of neurotransmitter released increased
no neurotransmitter was released
the amount of neurotransmitter released did not change
the amount of neurotransmitter released decreased8. Calcium and magnesium are both _______.
monovalent anions
divalent cations monovalent cations
divalent anions