To measure temporal summation in single cells, what does a researcher measure? a. The flow of neurotransmitters b. Electromagnetic waves at the scalp c. Depolarizations of the postsynaptic neuron d. The velocity of the action potential
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Temporal summation refers to the process in which repeated or continuous stimulation of a neuron leads to an accumulation of postsynaptic potentials, which can eventually reach the threshold for generating an action potential. Show more…
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Adi S.
You measure changes in membrane potential in an ON-center bipolar cell that is exposed to light in the center of its receptive field. What response would you expect to see? a. An action potential b. Depolarization due to increased release of glutamate by the photoreceptor cell c. Hyperpolarization due to decreased release of glutamate by the photoreceptor cell d. Hyperpolarization due to increased release of glutamate by the photoreceptor cell e. Depolarization due to decreased release of glutamate by the photoreceptor cell 28. The mechanism that accounts for light-induced hyperpolarization of photoreceptors is a. the gating of ion channels by released retinal monomers. b. a sudden increase in the concentration of cAMP, leading to activation of potassium channels. c. a rapid fall in the concentration of cGMP, leading to closure of Na+/Ca2+ channels. d. a rapid rise in the concentration of cGMP, leading to closure of Na+/Ca2+ channels. 29. You conduct a voltage clamp experiment in which you hold the presynaptic terminal of a glutamatergic neuron at 0 mV. When you treat the terminal with TTX, an inward current is recorded. Which ion and ion channels are responsible for the current you observe? a. Calcium; voltage-gated calcium channels b. Sodium; voltage-gated sodium channels c. Potassium; voltage-gated potassium channels d. Calcium; ligand-gated non-specific cation channels
Madhur L.
In temporal summation Select one: A IPSPs; but not EPSPs; are combined B. The postsynaptic cell's potential is & combination of two EPSPs arriving at & synapse in rapid succession: C. Two synapses on different regions of a cell are stimulated at the same time: D. A synapse is stimulated a second time after the effect of a first stimulus at the synapse has been terminated: E. The size of an action potential depends on the size of the stimulus
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