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A & P: Final Exam (Test #3)
Terms in this set (50)
Maintenance of the resting membrane potential is possible due to:
-ATP expenditure of the neuron.
-actions of sodium-potassium pump.
A typical resting membrane potential for a nerve cell is 70 mV.
The chief contributor to the negative charge of a resting neuron's intracellular fluid is:
a high intracellular concentration of anionic proteins.
Of the following types of joints, which type occurs only in the skull?
An intensely painful stimulus is distinguished from a mildly painful one by:
-an increase in the frequency of action potentials
-an increased number of receptors stimulated.
-more neurotransmitter released at the presynaptic terminals over a period of time (e.g. 100 ms)
In which area of the cerebral cortex is the primary motor cortex located?
What molecule could not serve as a second messenger, for a G-protein linked metabotropic receptor?
Hyperpolarization of the neuron refers to:
an increase in membrane potential.
At which level of the somatosensory system are conscious decisions made about low-grade touch stimuli?
Which brain region contains the pineal gland and is the site of melatonin synthesis?
Suppose the current in a circuit was equal to 2 amps, and the applied voltage was 20 volts. How much resistance would you expect in this circuit? (Your answer should be an integer)
During the events involved in information transfer across a chemical synapse, which step would be directly interrupted by exposing a neuron to a calcium channel blocker?
Neurotransmitter exocytosis from the presynaptic neuron
Which of the following is NOT part of the peripheral nervous system?
The 3rd ventricle is associated with which brain region below?
The brain contains 5 ventricles.
Of the following memory types, which require conscious attention?
In your work for a pharmaceutical company, you have just created a neurotransmitter that opens K+ channels in neurons. A neuron under the influence of this neurotransmitter will _____.
be less likely to fire an action potential
The receptor in the synapse between postganglionic sympathetic neurons and their target tissue is
alpha & beta adrenergic
Which of the following sets of conditions accurately describes the anatomy of the parasympathetic nervous system?
Craniosacral origin; long preganglionic fibers; ganglia in visceral effector organs
Which type of membrane channel below is always open?
What is the pH of a solution with a hydroxyl ion [OH - ] concentration of 10 -8 M. (Your answer should be an integer)
How is it possible that norepinephrine can cause vasoconstriction in one location but vasodilation in another?
Receptor types differ in these tissues.
The pons belongs to which major brain region?
The maximal force will be developed by a muscle at its
Axoplasmic flow of substances towards the axonal terminal of a neuron is termed __________ movement.
In electricity, like charges attract each other.
THE SODIUM-POTASSIUM PUMP HAS NOTHING TO DO WITH THE GENERATION OF A SINGLE ACTION POTENTIAL
Damaged basal nuclei, as in Parkinson's disease, result in __________.
the inability to monitor the intensity of movements
Which neural transmitter is released from most postganglionic sympathetic fibers on to their targe tissue?
Which cranial nerve is X?
What is the structural unit of the nervous system? (Your answer should be a single word.)
When chemical equilibrium is reached:
no further net change in the amounts of reactants and products occurs
The movement of potassium out of an animal cell requires
a potassium channel protein
What is the name of the connective tissue sheath that binds groups of nerve fibers into bundles?
Which type of potential change does not decays with distance?
Which body region below would you not expect to feel referred pain from cardiac ischemia?
cardiac ischemia could be felt in all of the above body regions
Suppose a cell has only K+ channels, at what membrane potential would the concentration and electric gradients for K+ be in balance? (Your answer should be an integer with either a plus or a minus sign before the number).
Which spinal nerve innervates the diaphragm muscle and is primarily responsible for anatomical respiration?
Which cranial nerve contains the largest percentage of preganglionic parasympathetic fibers in your body?
Ouabain, a specific inhibitor of the Na+-K+-pump, is applied to a neuron. The next action potential that fires after ouabain application will appear ________.
the same as normal
Which type of glial cell is the most abundant, versatile, and highly branched of glial cells?
The portion of an axon that communicates with its target cell is the axon _________ .
Sodium ion concentration in the cytoplasm of a neuron __________ when its voltage-gated potassium channels open.
During embryological development, the diencephalon becomes all of the following except the ...
Which structure below, can be considered a "modified" sympathetic ganglion?
Generally speaking, opening potassium channels in the postsynaptic membrane will result in an __________.
inhibitory postsynaptic potential (IPSP)
Suppose the resistance in a circuit was equal to 30 ohms, and the applied voltage was 120 volts. How much current would you expect to flow through this circuit? (Your answer should be an integer).
You would expect a neuron that depolarizes to -45 mV would:
fire an action potential with a peak of +30 mV.
Which cranial nerve is the exception and travels to the thoracic and abdominal cavities?
Which area of the body receives no innervation by the parasympathetic nervous system?
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