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| 1 | |
Predict the consequence of a reduced intracellular K+ concentration on the resting membrane potential. |
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| 2 | |
A child eats a whole bottle of salt (NaCl) tablets. What effect would this have on action potentials? |
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| 3 | |
Lithium ions reduce the permeability of plasma membranes to Na+. Predict the effect lithium ions in the extracellular fluid would have on the response of a neuron to stimuli. |
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| 4 | |
Some smooth muscle has the ability to contract spontaneously. That is, it contracts without any external stimulation. Propose an explanation for the ability of smooth muscle to contract spontaneously based on what you know about membrane potentials. Assume that an action potential in a smooth muscle cell causes it to contract. |
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| 5 | |
Assume that you have two nerve fibers of the same diameter, but one is myelinated and the other is unmyelinated. Along which type of fiber is the conduction of an action potential most energyefficient?
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| 6 | |
Explain the consequences when an inhibitory neuromodulator is released from a presynaptic terminal and a stimulatory neurotransmitter is released from another presynaptic terminal, both of which synapse with the same neuron. |
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| 7 | |
With aging, the speed of action potential propagation and synaptic transmission decreases. List possible explanations. |
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| 8 | |
Students in a veterinary school were given the following hypothetical problem. A dog ingests organophosphate poison, and the students are responsible for saving the animal's life. Organophosphate poisons bind to and inhibit acetyl cholinesterase. Several substances they could inject include the following: acetylcholine, curare (which blocks acetylcholine receptors), and potassium chloride. If you were a student in the class, what would you do to save the animal? |
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| 9 | |
Strychnine blocks receptor sites for inhibitory neurotransmitter substances in the CNS. Explain how strychnine could produce tetanus in skeletal muscles. |
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