ASU BIO 181 Exam 3 2025/2026 Exam
Questions and Corresponding Answers
with Surety of 100% Pass Mark
Excitatory synapses make the post-synaptic cell less likely to fire. -
🧠ANSWER ✔✔False
The neural tissues are: - 🧠ANSWER ✔✔Spinal cord, sensory neurons, and
brain
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? -
🧠ANSWER ✔✔The cell wraps extensions of a fatty insulating substance
(myelin) around the axons of neurons.
The action potential is: - 🧠ANSWER ✔✔A result of the movement of ions.
Receptors are made from membrane-bound polyribosomes. - 🧠ANSWER
✔✔True
, List the 4 types of glial cells and list a phrase to describe their function. -
🧠ANSWER ✔✔Microglia: cleans up cellular debris- Astrocytes: support and
repair neurons- Schwann Cells: myelinates axons of the neurons in the
PNS- Satellite: form the brain-blood barrier within the CNS
Acetylcholine exocytosed from the presynaptic cell travels to the
postsynaptic cell to start the action potential in the postsynaptic cell. -
🧠ANSWER ✔✔True
When the presynaptic cell contacts a muscle cell, the synapse area is
called a motor end plate. - 🧠ANSWER ✔✔True
Potassium ions are at high concentrations inside of cells including in
neurons. - 🧠ANSWER ✔✔True
The membrane potential (resting potential) is largely set by the Na-K-
ATPase pump. - 🧠ANSWER ✔✔True
Draw an action potential in the axon of a neuron and indicate which ions
flow into the neuron and out of the neuron as the action potential passes at
the point where the electrodes are in the cell. Be sure to assign on the Y-
axis the mV of each of these areas. This should be as described in my
lectures. - 🧠ANSWER ✔✔
Questions and Corresponding Answers
with Surety of 100% Pass Mark
Excitatory synapses make the post-synaptic cell less likely to fire. -
🧠ANSWER ✔✔False
The neural tissues are: - 🧠ANSWER ✔✔Spinal cord, sensory neurons, and
brain
How do the glial cells (i.e., myelin sheath) speed up the firing of neurons? -
🧠ANSWER ✔✔The cell wraps extensions of a fatty insulating substance
(myelin) around the axons of neurons.
The action potential is: - 🧠ANSWER ✔✔A result of the movement of ions.
Receptors are made from membrane-bound polyribosomes. - 🧠ANSWER
✔✔True
, List the 4 types of glial cells and list a phrase to describe their function. -
🧠ANSWER ✔✔Microglia: cleans up cellular debris- Astrocytes: support and
repair neurons- Schwann Cells: myelinates axons of the neurons in the
PNS- Satellite: form the brain-blood barrier within the CNS
Acetylcholine exocytosed from the presynaptic cell travels to the
postsynaptic cell to start the action potential in the postsynaptic cell. -
🧠ANSWER ✔✔True
When the presynaptic cell contacts a muscle cell, the synapse area is
called a motor end plate. - 🧠ANSWER ✔✔True
Potassium ions are at high concentrations inside of cells including in
neurons. - 🧠ANSWER ✔✔True
The membrane potential (resting potential) is largely set by the Na-K-
ATPase pump. - 🧠ANSWER ✔✔True
Draw an action potential in the axon of a neuron and indicate which ions
flow into the neuron and out of the neuron as the action potential passes at
the point where the electrodes are in the cell. Be sure to assign on the Y-
axis the mV of each of these areas. This should be as described in my
lectures. - 🧠ANSWER ✔✔
