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HUBS1416 EXAM QUESTIONS AND ACCURATE ANSWERS A+ GRADED
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HUBS1416 EXAM QUESTIONS AND ACCURATE ANSWERSA+ GRADED
Synapse
An impulse from one nerve cell is communicated to another nerve cell via the :
Depoloarisation
Opening of sodium channels in the membrane of a neuron results in:
Disorders of impulse conduction
A patient who show signs of myelin damage is bound to show neurological symptoms
owing to:
plays a significant role in maintaining posture
The Stretch Reflex
A synapse is
a site where cells communicate chemically with one another
Interior surface is negatively charged and has fewer sodium ions
How does interior surface of a cell membrane of a neuron differ from the external
surface when the neuron is at rest
Moro reflex
usually present until about 4-5mths of age
Neurotransmitters
Communication across a synapse involves the release of?
,The pain neuron synapses with three other neurons
effector muscles cause removal from the source of pain
both the excitation and inhibition of motor neurons take place
Withdrawal reflex:
stimulation of a sensory receptor
The initial event in the activation of a reflex arc is the:
action of a muscle
The final event in the activation of a reflex arc is the:
The neuron would not be able to conduct action potentials
Tetrodotoxin is a toxin that blocks the voltage-gated sodium channels from opening.
What effect would this have on the function of neurons
- The sensory neuron involved in the reflex
- The motor neuron involved in the reflex
- The Central Nervous System
Testing a reflex can give information about:
We have an expert-written solution to this problem!
Sodium, Potassium
extracellular fluid contains high concentrations of _________, while intracellular fluid
contains high concentrations of _________
Stretch reflex
The knee jerk reflex is an example of a:
,afferent, PNS
Sensory neurons travelling in a cranial nerve would be part of the ________ division of
the ________
mixed (sensory and motor)
Spinal nerves are:
withdrawal
Accidentally touching the hot burner of a stove will elicit a(n) _________ reflex
afferent nerves
Nerves that carry impulses toward the CNS are:
Receive stimuli from the environment or from other neurons
In the neuron, the dendrites are the parts that:
Requires ATP to function
Sodium-potassium exchange pump
The axon would not be able to fire action potentials
Puffer fish poison works to occlude voltage-gated sodium channels, like corking a
bottle. What effect would this neurotoxin have on the activity of neurons?
Potassium
What channels are opened directly after an action potential has fired so that the
membrane potential returns back to rest?
, Nerve impulse transmission is hindered and may altogether cease to have effects on
muscle and sensory activity
Multiple Sclerosis (MS) is a progressive autoimmune disease that results in
demyelination of affected axons,. What is the reason why people suffering from MS show
impairment of both motor and sensory functions
Stretch reflex 0, low muscle tone in left leg.
A man who has suffered damage to his left L4 spinal nerve has paralysis of muscles in
his left leg. Based upon such damage, which of the subsequent findings is most likely?
On each of our retinas, there is a spot known as the fovea which provides good, high
acuity vision. When humans and other animals turn to look at something they are
interested in, they are "foveating", which means they are moving their eyes so that the
image they are interested in will fall on the fovea. What type of receptors do you predict
would be present at high density in this part of the retina?
Cones
Proprioceptors
Name the type of receptors implicated in the reflexes that maintain muscle tone and
body posture
Cervical
Polly is an avid rower who recently suffered a back injury out on the water. Polly had
pain and bruising along her back and on examination was found to have decreased
stretch reflexes in her biceps, triceps and shoulder muscles on her left side. All other
stretch reflexes were normal. The doctor concluded that although the injury had
affected her back, the damage had been to a spinal nerve as it emerged from the
vertebral column. From which region of the vertebral column would the spinal nerve
have to be emerging to produce these problems
Herpes zoster, T10
Lucinda has shingles. The painful eruptions are around her body in a band at about the
level of her belly button (umbilicus). What is the infectious agent, and what spinal nerve
is affected in Lucinda's case
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