Which of the following stimuli could trigger the opening of a voltage-gated channel? O a chemical signal any of these could trigger the opening of a voltage-gated channel Oa change in the cellâ s membrane potential physical force on the cell
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- The abundant intercellular connections gab junction can be found in O diaphragm O Heart muscle O Skeletal muscle O Smooth muscleWhat is the major determinant of the permeability of a membrane to a specific ion? Concentration of the ion outside the cell O Concentration of the ion inside the cell Number of open ion channels specific for that ion O Electrical charge of the ionmbing fiber depolarizes mbrane potential to en Ca2+ channels. tage-gated channel 2+ Ca²+ Release 2+ Ca²+ Endoplasmic reticulum removal of AMPA receptors from the postsynaptic membrane. insertion of AMPA receptors into the postsynaptic membrane O increase in intracellular Ca2+ via voltage-gated Ca2+ channels O DAG- and Ca2+-mediated activation of PKC increase in intracellular Ca2+ via endoplasmic reticulum IP3 receptors
- The neuron membrane includesa lipid bilayer.channel proteins.signal proteins.all of the aboveboth A and BWhich of the following is not an excitatory ligand-gated ion channel? NACHR AMPAR ASIC GABA-ARThe resting voltage of the cell membrane: O is a property of the cell O is generated by mechanically-gated channels, voltage-gated channels, and ligand-gated channels O is defined by the difference in overall ionic charges between the two sides of the membrane O has a negative value at rest in all cells except neurons O all of the above
- Which of the following can be correctly applied to gap junctions? Select all that apply Allows small molecules and ions to travel between cells They are membrane channels that allow communication between neighboring cells O Prevents cells from separating from one another O They behave as gated ion channelsThe membrane voltage in graded potentials can be produced by Oopen channels and ligand-gated chanels Ovoltage-gated channels Oligand-gated and mechanically gated channels Oligand-gated channels mechanically gated channelsWhat membrane process releases neurotransmitters into the synapse during an action potential O Active transport O Endocytosis O Phagocytosis O Exocytosis None of these is correct
- When a membrane is at rest, which channels are open? O Voltage-gated calcium channels O Voltage-gated potassium channels Leaky potassium channels O All the channels listed are open O Votlage-gated sodium channelsWhich of the following is the correct statement regarding ion channels? Physical deformation of the membrane cannot open ion channels Ligand-gating means that an ion binds to the channel, which stimulates its opening. If the channel pore was the right size, Na and K could both pass through because they have the same charge A voltage gated Na channel can open to allow Na movement against its electrochemical gradientIf the intracellular concentration of sodium ions in a cell is 5 mM and the extracellular concentration is 140 mM, which of the following would be TRUE? a at room temperature the equilibrium potential of sodium would be -84 mV b if the cell was only permeable to sodium its membrane potential would be negative c sodium ions would tend to move by simple diffusion into the cell d all of the above e none of the above