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BIO 181 ASU EXAM 3 2025 QUESTIONS AND
ANSWERS.
1. T or F: Potassium ions are at high concentrations inside of
cells, including neurons - correct answer - True
2. The action potential is a result of: - correct answer - the
movement of ions
3. The post-synaptic cell can be: - correct answer - in glands,
muscle cells and neurons
4. Th resting potential of a neuron is - correct answer - -60mV
5. T or F: The cell body refers to the part of the neurons that
begin at the dendrites and extend to the axon terminal - correct
answer - false
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6. T or F: Voltage gated ion channels open when a protein binds
to the receptor - correct answer - false
7. T or F: Excitatory synapses cause hyperpolarization of post-
synaptic cells - correct answer - false
8. T or F: Acetylcholinesterase breaks acetylcholine into
muscarinic acid - correct answer - false
9. In the motor end plate, the event that is the immediate trigger
for exocytosis is - correct answer - calcium ions
10. T or F: Fast Neurons as described in lecture require
cytoplasmic signal transduction to open an ion channel. -
correct answer - False
11. T or F: Only pre-synaptic neurons are coated with myelin. -
correct answer - False
BIO 181 ASU EXAM 3 2025 QUESTIONS AND
ANSWERS.
1. T or F: Potassium ions are at high concentrations inside of
cells, including neurons - correct answer - True
2. The action potential is a result of: - correct answer - the
movement of ions
3. The post-synaptic cell can be: - correct answer - in glands,
muscle cells and neurons
4. Th resting potential of a neuron is - correct answer - -60mV
5. T or F: The cell body refers to the part of the neurons that
begin at the dendrites and extend to the axon terminal - correct
answer - false
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6. T or F: Voltage gated ion channels open when a protein binds
to the receptor - correct answer - false
7. T or F: Excitatory synapses cause hyperpolarization of post-
synaptic cells - correct answer - false
8. T or F: Acetylcholinesterase breaks acetylcholine into
muscarinic acid - correct answer - false
9. In the motor end plate, the event that is the immediate trigger
for exocytosis is - correct answer - calcium ions
10. T or F: Fast Neurons as described in lecture require
cytoplasmic signal transduction to open an ion channel. -
correct answer - False
11. T or F: Only pre-synaptic neurons are coated with myelin. -
correct answer - False
