Which of the following are true regarding the differences between EPSPs and IPSPs? i. EPSP involves depolarisation of the postsynaptic membraneii. glutamic acid (glutamate) is a neurotransmitter involved in IPSPsiii. both of these chemical synapses occur in the CNSiv. when EPSPs occur at the neuromuscular junction, the endplate potential is always above threshold (an action potential is always triggered)v. Both EPSPs and IPSPs involve Na+ channels
Question
Which of the following are true regarding the differences between EPSPs and IPSPs? i. EPSP involves depolarisation of the postsynaptic membraneii. glutamic acid (glutamate) is a neurotransmitter involved in IPSPsiii. both of these chemical synapses occur in the CNSiv. when EPSPs occur at the neuromuscular junction, the endplate potential is always above threshold (an action potential is always triggered)v. Both EPSPs and IPSPs involve Na+ channels
Solution
i. True - Excitatory postsynaptic potentials (EPSPs) involve the depolarization of the postsynaptic membrane. This means that the membrane potential becomes less negative, moving closer to the threshold potential and increasing the likelihood of an action potential.
ii. False - Glutamic acid (glutamate) is typically associated with EPSPs, not inhibitory postsynaptic potentials (IPSPs). For IPSPs, neurotransmitters like GABA and glycine are more commonly involved.
iii. True - Both EPSPs and IPSPs occur in the central nervous system (CNS). They are fundamental to the complex interplay of excitation and inhibition that drives neural processing in the brain.
iv. False - While EPSPs at the neuromuscular junction do lead to an endplate potential, it is not always above the threshold to trigger an action potential. The endplate potential must reach a certain threshold to trigger an action potential. If the stimulus is not strong enough (subthreshold), an action potential will not be triggered.
v. False - While EPSPs do involve the opening of sodium (Na+) channels, IPSPs typically involve the opening of potassium (K+) channels (leading to an efflux of K+ and hyperpolarization) or chloride (Cl-) channels (leading to an influx of Cl- and hyperpolarization).
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Excitatory postsynaptic potentials (EPSPs) move the membrane potential threshold. Inhibitory postsynaptic potentials (IPSPs) move the membrane potential threshold.
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IPSP is to EPSP as*excitatory is to inhibitorypresynaptic is to postsynapticcable properties are to noncable propertieshyperpolarization is to depolarizationgraded is to nongraded
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