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HUBS1416 Practice Exam Questions And Correct Answers
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HUBS1416 Practice Exam Questions And Correct AnswersThe first step in the activation of a reflex arc is the :
activation of a motor neuron.
activation of a sensory receptor.
inhibition of a sensory neuron.
information processing.
*
activation of a sensory receptor.
Accidentally touching the hot burner of a stove will elicit a(n) __________ reflex.
stretch
rooting
tendon
withdrawal
*withdrawal
Puffer fish poison blocks voltage-gated sodium channels like a cork. What effect would
this toxin have on the function of neurons?
The axon would not be able to generate action potentials.
The neuron would not be metabolize glucose
The neuron would take longer to recover after each action potential
None, since the chemically gated sodium channels would still work.
***
,The axon would not be able to generate action potentials.
Intracellular fluid contains high concentrations of __________, while extracellular fluid
contains high concentrations of __________.
sodium, potassium
potassium, sodium
cations, ions
proteins, electrolytes
**urnesium: sodium, potassium
How does the inside surface of a cell membrane of a neuron compare with the outside
surface when the neuron is at rest?
A. Inside surface is positive charged and has less sodium ions
B. Inside surface is negative charged and fewer sodium ions
C. Inside surface is negative charged and more sodium ions
D. Inside surface is positive charged and has more sodium ions
****
Interior surface is negatively charged and has fewer sodium ions
Communication across a synapse involves the release of :
ATP.
neurotransmitters.
enzymes.
buffers.
**
,neurotransmitters.
The Moro reflex is usually present until about:
11-13 years of age
11-12 months of age
5-6 years of age
4-5 months of age
**
4-5 months of age
The sodium-potassium exchange pump:
transports potassium ions out of the cell during repolarisation.
moves sodium and potassium down their chemical gradients.
transports sodium ions into the cell during depolarisation.
requires ATP in order to function.
**
requires ATP in order to function.
A synapse is :
a specialised site where two axons communicate electrically.
the point where neurotransmitters are assembled.
, a specialised site where cell to cell chemical communication takes place.
the point where the action potential is generated
**
a specialised site where cell to cell chemical communication takes place.
A patient who show signs of myelin damage is likely to have neurological symptoms due
to:
problems with creation of an impulse
problems with impulse conduction (propagation)
problems with neurotransmission
problems with maintenance of a membrane potential
***
problems with impulse conduction (propagation)
Multiple Sclerosis (MS) is a progressive autoimmune disorder that results in the
demyelination of affected axons. Why do individuals with MS have problems with both
movement and sensation?
The disease affects unmyelinated axons of the peripheral nervous system leading
muscles to contract involuntarily and abnormal sensations are created.
This disease targets general sensory nerves which reduce motor pathway reflexes.
Slowing and even complete loss of the conduction of nerve impulses result in a decline
in muscle and sensory activities.
A speeding up of the propagation of nerve impulses results in inadequate time for the
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