BIO 22 Questions and Answers
Which are structural classifications of neurons?
bipolar neurons
pseudounipolar neurons
Schwann cells and satellite cells are located within the _______.
Multiple choice question.
peripheral nervous system
The nodes of are gaps in the myelin sheath s...
BIO 22 Questions and Answers
Which are structural classifications of neurons? - answer bipolar neurons
pseudounipolar neurons
Schwann cells and satellite cells are located within the _______.
Multiple choice question. - answer peripheral nervous system
The nodes of are gaps in the myelin sheath surrounding axons. - answer Ranvier
The highly selective barrier to diffusion that the specialized capillaries of the brain create
is known as the barrier. - answer blood-brain
All cells in the body maintain a potential difference in voltage across their membrane,
called the , in which the inside of the cell is negatively charged in comparison to the
outside of the cell. - answer resting membrane potential
Which of the following are FUNCTIONAL classifications of neurons? - answer
efferent neurons
autonomic motor neurons
sensory neurons
Open ion channels have the effect of ______. - answer increasing membrane
permeability
When sodium enters an axon, the inside of the axon becomes ______ negative. -
answer less
What is it called when there is a change in the membrane potential that is propagated or
regenerated down the length of an axon? - answer Action potential
When ion channels are open, the plasma membrane is permeable than when the
channels are closed. - answer more
The nodes of Ranvier are gaps in surrounding nerve cells. - answer myelin sheath
Place the events of the action potential in order chronologically. - answer 1.
Threshold reached
2.Na+ channels open fully and Na+ enters cell
3. Na+ channels inactivated
4. K+ channels open fully and K+ leaves cell
5.K+ channels inactivated
, Conduction of action potentials in a myelinated axon is: - answer continues without
decrement
called saltatory conduction
is faster than in an unmyelinated axon
A propagated change in the membrane potential of a neuron due to the opening and
closing of voltage gated channels is called a(n) - answer action potential
A(n) is the connection between a neuron and either another neuron or an effector cell. -
answer synapse
Changes in the permeability of the membrane are due to: - answer the opening and
closing of ion channels
The synaptic cleft is ______. - answer the space between pre- and postsynaptic
cells.
conduction occurs within myelinated axons. - answer Saltatory
The neurotransmitter of somatic motor neurons and some autonomic nerve endings is
______. - answer acetylcholine
A synapse is ______. - answer the connection between a neuron and a second cell
What are connexin protein channels that allow the movement of molecules between
adjacent cells called? - answer Gap junctions
A(n) channel is depicted in the figure. - answer ligand-gated
What enzyme is responsible for the inactivation of acetylcholine at the synaptic cleft? -
answer Acetylcholinesterase
Acetylcholine (ACh) is a , that can be either excitatory or inhibitory depending upon the
binding cell. - answer neurotransmitter
What is a neuron classified as if it uses acetylcholine as its neurotransmitter? - answer
Cholinergic
The inactivation of acetylcholine is done by an enzyme called which is present on the
postsynaptic membrane or in the synaptic cleft. - answer acetylcholinesterase or
AChE
What are monoamines? - answer Regulatory molecules derived from amino acids
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