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The strength of a stimulus to a neuron is encoded by

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15. The strength of a stimulus to a neuron is encoded by:A. The frequency of graded potentials and action potentialsB. The sum of action potentials and graded potentialsC. The amplitude of the graded potential and frequency of action potentialsD. The duration of graded potentials and action potentialsE. The multiplicative effect of graded potentials and action potentials
16. In an action potential, which is the best explanation for the falling phase after the peak of thespike?
17. The hopping of an action potential from one node of Ranvier to the next is called:
18. Which of the following best describes hyperkalemia?
D. Elevated extracellular potassium hyperpolarizes neurons making them more excitableE. Reduced extracellular potassium hyperpolarizes neurons making them less excitable19. Paracrine signals can best be described as:A. Synaptic signals across gap junctionsB. Transmitter release that diffuses in extracellular space to affect multiple cellsC. Transmitter release that is spatially localized to a single synapseD. Synaptic signaling that acts through mechanical contacts between cellsE. Synaptic signals that feed back to the cell that released the transmitter
20. Which of the following disrupts SNARE proteins at presynaptic terminals that releaseacetylcholine?

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