At rest, a neuron has a lower concentration of sodium than the surrounding fluid. When a neuron sends a signal, it opens sodium channels. What happens to the sodium when the sodium channels open? O A. The sodium diffuses out of the cell. O B. The sodium is pumped into the cell. O C. The sodium is pumped out of the celI. O D. The sodium diffuses into the cell.

At rest, a neuron has a lower concentration of sodium than the surrounding fluid. When a neuron sends a signal, it opens sodium channels. What happens to the sodium when the sodium channels open? O A. The sodium diffuses out of the cell. O B. The sodium is pumped into the cell. O C. The sodium is pumped out of the celI. O D. The sodium diffuses into the cell.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter41: Neural Signaling

Section: Chapter Questions

Problem 9TYU

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Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
When the neuron’s membrane is at rest, where are the sodium ions and potassium ions most concentrated?A. Sodium is mostly outside and potassium is mostly inside.B. Sodium is mostly inside and potassium is mostly outside.C. Both ions are mostly inside the cell.D. Both ions are mostly outside the cell.
At rest, a neuron has a lower concentration of sodium than the surrounding fluid. When a neuron sends a signal, it opens sodium channels. What happens to the sodium when the sodium channels open? A. The sodium diffuses out of the cell. B. The sodium is pumped into the cell. C. The sodium is pumped out of the cell. D. The sodium diffuses into the cell.
In the membrane of a neuron, what happens during an IPSP? A. All the ion gates in the membrane close. B. The sodium gates open. C. The potassium or chloride gates open. D. All the ion gates in the membrane open.
A neuron may receive signals from thousands of synaptic terminals. What determines whether the receiving neuron will respond by transmitting a signal? a. the concentration of transmitter inside the receiving neuron b. the summation of excitatory and inhibitory signals received c. the number of glial cells contact the receiving neuron
a) How does E allow faster transmission of signals? b) What would happen if G has a lack of Calcium? c) Most neurons have the style of junction (chemical) shown in the diagram, rather than gap (electrical) junctions. Why does this make sense?
What membrane protein of the neuron is responsible for briefly increasing the Na+ permeability of the membrane during the rising phase of the nerve impulse? a. the sodium-potassium pump b. the voltage gated potassium channel c. the voltage gated sodium channel d. the stimulus gated sodium channel e. the ligand gated ion channel
Compared to sparrows, neurons in larger dinosaurs would probably have ______________ myelin and be ____________ than sparrow neurons. A) less, wider B) less, narrower C) more, wider D) more, narrower
Which of the following best describes the electrical state of a neuron at rest? a. The inside of a neuron is more negatively charged than the outside. b. The outside of a neuron is more negatively charged than the inside. c. The inside and the outside of a neuron have the same electrical charge. d. Potassium ions leak into a neuron at rest.
During the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold
When a neuron is at rest,_____ . a. it is at threshold potential b. voltage-gated sodium channels are open c. sodium–potassium pumps are operating d. it contains more sodium ions than the surrounding interstitial fluid
Suppose you want to cause the presynaptic terminal of an axon to release its transmitter. How could you do so without an action potential?A. Decrease the temperature at the synapse.B. Use an electrode to produce IPSPs in the postsynaptic neuron.C. Inject water into the presynaptic terminal.D. Inject calcium into the presynaptic terminal.