When summation of multiple graded synaptic potentials occurs which of the following would "neutralize/cancel out" an EPSP in dendrites? A. opening a voltage gated sodium channel B. opening a voltage gated calcium channel  C. openning a ligand gated calcium channel D. closing a ligand gated potassium channel E. opening a ligand gated chloride channel

If the Cl- concentrations inside and outside of a neuron are 100 and 10 mM, respectively and the membrane potential is 30 mV, what would be the driving force on Cl- ions? Will chloride enter or exit the cell? Assume that the membrane is highly permeable to chloride. O a. 61 mV; enter O b. -41 mV; enter c. -31mV; exit O d. 91 mV; enter Ое. -82.8 mV; enter

The input region lacks _________________, but contains _____________________,  Group of answer choices A. Ligand-gated channels, voltage gated channels B. K+ leak channels, voltage gated channels C. Voltage-gated channels, ligand gated channels D. Ligand-gated channels, K+ leak channels

Postsynaptic potentials are graded potentials that develop in the postsynaptic membrane. Which one of the following statements accurately describes what causes EPSP's to occur at the postsynaptic membrane?   Group of answer choices A.an EPSP results from the opening of voltage gated sodium channels B.an EPSP results from the opening of chemically gated sodium channels C.an EPSP results from the opening of voltage gated potassium channels D.an EPSP results from the opening of chemically gated potassium channels

The transmission of action potentials down a myelinated axon is faster but "saltatory" because of which of the following?   A. the passive transmission of action potentials is faster but degrades the action potential   B. voltage-gated sodium channels are only found in the Nodes of Ranvier   C. active transmission of action potentials does not degrade the action potential but is slow   D. A and C are correct   E. all of the above are correct

The axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential?   A. Na+ channels close in a voltage-dependent manner   B. Na+ channels close in a time-dependent manner   C. Na+ channels close in a chemically-dependent manner   D. Na+ channels open in a voltage-dependent manner

Match the description with the statement that best describes the following regions                                                             synaptic knob                                                             axon hillock                                                             dendrites                                                             axon A. elongated projection that conducts electrical signals over long distances B. receives input from other neurons C. region of high denisty of voltage-gated channels, known as the trigger zone D. contains numerous vesicles containing neurotransmitter