Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
What cells produce myelin in the peripheral nervous system?
|
Schwann cells
|
Microglia cells
Schwann cells Oligodendrocytes Astrocytes |
|
|
With an injury to the central nervous system, all of the following would occur except:
|
Myelin regeneration
|
Inflammation
Asrocyte proliferation Scar formation Microglia cell recruitment Myelin regeneration |
|
|
A 36 year-old female comes into your office because she has been experiencing clumsiness, incoordination in her hands and feet, and problems with peripheral vision. You should suspect:
|
Multiple Sclerosis
|
Myasthenia Gravis
Amyotrophiclateral Sclerosis Multiple Sclerosis Vit. A deficiency |
|
|
Your patient presents with ptosis, facial muscle weakness, dysphonia, and dysphagia. You should suspect:
|
An upper motor neuron lesion
|
A lower motor neuron lesion
An upper motor neuron lesion A problem with nicotinic acetylcholine receptors Curare poisoning |
|
|
All of the following are symptoms of an upper motor lesion except
|
Hyporeflexia
|
Spasticity
Hyporeflexia Hypertonic muscles Muscular Atrophy |
|
|
A person is admitted to the emergency room due to cardiac arrest. The ER doctor will inject what into the heart to try and stimulate a contraction?
|
Atropine
|
Acetylcholine
Atropine Curare Nicotine |
|
|
Choose the correct pairing for Acetylcholine nicotinic receptors
|
Antagonist: curare
|
Agonist: muscarine
Agonist: epinephrine Antagonist: curare Antagonist: atropine |
|
|
Which of the following is most responsible for resting membrane potential:
|
Non gated Na channels
|
Non gated ion channels
Na/K pump Gated Na channels influx of Na |
|
|
Hyperpolarization occurs when
|
K leaves the cell and brings the membrane potential to -70mV
|
Na floods into the cell and brings the membrane potential to +40mV
Na leaves the cell and brings the membrane potential to +40mV K floods into the cells and brings the membrane potential to -70mV K leaves the cell and brings the membrane potential to -70mV |
|
|
During the absolute refractory phase an action potential:
|
Will not happen since the Na gates are locked
|
May happen as long as the stimulus is strong enough
Will not happen since the K gates are locked Will not happen since the Na gates are locked Will happen when extra Cl ions are present |
|
|
The resting membrane potential is closest to what ion equilibrium and for what reason?
|
Na because there are less Na channels compared to K
|
K because there are more K channels than Na channels
Cl because Cl is allowed to freely pass through the membrane Na because there are less Na channels compared to K K because the Na/ K pump does not require energy |
|
|
What type of signal does the presynaptic membrane of a neuron generate
|
Action potential
|
Action potential
Receptor potential Synaptic potential Neuron potential |
|
|
Release of neurotransmitters from the presynaptic membrane depends on what and occurs by what type of mechanism?
|
Ca influx - exocytosis
|
K influx - endocytosis
Ca influx - exocytosis Na influx - exocytosis Ca influx - endocytosis |
|
|
Which of the following is an autoimmune disease of the neuromuscular juction?
|
Myasthenia gravis
|
Guillian Barre Syndrome
Myasthenia Gravis Multiple Sclerosis Lou Gherig's Disease |
|
|
What type of change occurs in the alpha-motor neuron cell body when an injury to a lower motor neuron occurs?
|
Chromatolytic reaction
|
Wallerian degeneration
Axonal degeneration Chromatolytic reaction No change |
|
|
All of the following neurotransmitters are usually excitatory except:
|
GABA
|
Glutamate
GABA Dopamine Acetylcholine |
|
|
All of the following happens to unused neurotransmitters except:
|
Reabsorbed
|
Reuptaken by endocytosis into the post-synaptic membrane
Destroyed in the cleft by acetylcholinesterase Reloaded in vesicles by glia cells Reabsorbed |
|
|
Choose the incorrect pairing:
|
Excitatory postsynaptic potential: makes the membrane more negative
|
Excitatory postsynaptic potential: depolarizes the membrane
Inhibatory postsynaptic potential: hyperpolarizes the membrane Inhibatory postsynaptic potential: makes the membrane more negative Excitatory postsynaptic potential: makes the membrane more negative |
|
|
Most sensory neurons are what type?
|
Pseudo-unipolar
|
Pseudo-unipolar
Unipolar Multipolar Bipolar |
|
|
Cerebral spinal fluid is found between what two layers?
|
Pia mater and arachnoid mater
|
Pia mater and dura mater
Pia mater and arachnoid mater Arachnoid mater and dura mater Dura mater and spinal cord |
|
|
Dendrites have myelin sheaths.
True or False? |
False
|
|
|
|
Conductile component of the neuron is the area responsible for propagating the action potential.
True or False? |
True
|
|
|
|
The amount of neurotransmitter released is based on the concentration of K ions.
True or False? |
False
|
|
|
|
Nodes of Ranvier are points along the axon that are not covered by myelin.
True or False? |
True
|
|
|
|
Astrocytes form the blood brain barrier.
True or False? |
True
|
|
