This exam test is written to expose managers in practice, experts, professionals and students to the reality of applying the concepts of human physiology
NSC2205 HUMAN PHYSIOLOGY
MULTIPLE CHOICE QUESTIONS
The resting membrane potential of nerve cells is primarily determined by: - Movement of
K+ OUT of the cell
You and an eagle, birds have higher body temperature. How should this affect the
resting potential of eagle neurons? - The resting potential should be more negative
What would be the resting membrane potential of a neuron if the concentration of K+
was doubled on the inside? - More negative than normal
The effect of the neurotransmitter glutamate - Depends on the type of receptor
Hyponatremia is a dangerous condition, which happens when your body sodium drops
to dangerously low levels. (too much water, not enough salt). How should this condition
of low extracellular Na+ concentration affect the nervous system? - Inability to produce
EPSPs
What is primarily responsible for the production of differential ion concentrations in the
cytosol and extracellular fluid? - Na/K pump
Which of the following is a sensory quality? - green
You find yourself in a huaurani ceremony in the jungles of Ecuador. They shaman offers
you a drink of a bitter tasting liquid. How do you know its bitter? - Alkaloids are
activating a secondary messenger system
In a few minutes you feel that you are loosing control of your limbs. After running some
tests you find that although action potentials are produced and neurotransmitters are
released in the synapses, you are unable to depolarize postsynaptic cells at fast
chemical synapses. What is the likely target of the toxin? - Ligand gated sodium
channels
While digging in the garden, you are bitten by a brightly colored bug. The toxin from the
saliva causes you to lose the ability to tell that you are touching anything. What type of
cells are affected by the toxin? - tonic mechanoreceptors
, Vertigo is often cause by infection and it results in loss of the ability to detect
acceleration. Therefore you feel like you are leaning or accelerating when you are not.
What is affected by the infection? - Hair cells imbedded in the cupola
Why was it easier to remember the dance moves when you knew that you were going to
have to perform for your classmates? - Motivation causes release of serotonin or
dopamine on the postsynaptic cell
Olfactory transduction is orders of magnitude more sensitive that gustation. What does
this tell you about the process of olfactory transduction? - Transduction includes
production of a secondary messenger
Why does salt make sweet food taste sweeter? - Increase salt concentration increases
prostate ion concentration gradient in the extracellular space
Pitch of music can be distinguished how? - different hair cells are sheared at different
frequencies
Tau proteins in a healthy neuron do what? - stabilize microtubules
Amyloid beta seems to be most toxic in what form? - The dimers and trimmers
Why is dance such a common activity for humans across almost all cultures? - All of the
above
In the paper about reconstructing lost memories what was the evidence that memory is
stored somewhere other than the synapse? - a reminder stimulus reconstitutes the
memory after loss of synaptic changes
If the concentration of chloride is high on the outside of the cell and low on the inside,
and chloride channels are opened (by binding of a neurotransmitter), what would this do
to the potential of the cell? - make it more negative
Bathing a mammalian heart in diluted fluid (with lower sodium concentration than
normal extracellular fluid) should do what to heart rate? - stay the same, but decrease
force
A mammal exhales air with a PO2 of 80 mmHg. What is the likely PO2 of systemic
arterial blood? - 78 mmHg
Which of the following should have he lowest oxygen affinity? - Hemoglobin from a
human exercising hard
Which of the following changes would NOT increase the rate of diffusion across
respiratory surfaces? - Increasing the PO2 of the blood entering the capillaries of the
lungs
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