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What ion enters a neuron causing depolarization of the
cell membrane?
a. sodium
b. chloride
c. potassium
d. phosphate
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- Which part of a neuron contains the nucleus?a. dendriteb. somac. axond. synaptic end bulbIn 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.The nerve impulses always travel in one direction from dendrites to axon terminals. What prevents an action potential from travelling backward? a. Hyperpolarization of the neuron makes the membrane more positive and prevents another action potential. b. After repolarization, the refractory period occurs, where the sodium ions are found outside the cell. c. After repolarization, the reversal of ions prevents another action potential as there would not be enough sodium ions outside the cell to rush in. d. The refractory period prevents another action potential by lowering the threshold potential.
- A neuron without an axon would be unable to a. conduct nerve impulses b. divide c. receive stimulation from other neurons d. store genetic materialBriefly discuss each function of the following parts of the neuron:a. Dendritesb. Cell bodyc. AxonWhat part of the membrane composition of a neuron is most important for the permeability of the membrane to various ions? Group of answer choices a. The outside and inside are charged b. There are proteins embedded in the membrane c. There is myelin around some cells d. Its ability to exist in fluid enviornment
- 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 cellI. B. The sodium is pumped into the cell. O C. The sodium is pumped out of the cell. D. The sodium diffuses into the cell. rered MacBook Air 吕口 F3 F1 F2 O00 F4 F5 F6 F7 F8 % & * 2 5 6 8 %244 2# 3During an action potential, the inside of the cell membrane becomes more positive than the outside. Why does this happen? a. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the inside more positive. b. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the outside more positive. c. During depolarization, the potassium ions rush in and the sodium ions have begun rushing out, making the inside more positive. d. During depolarization, the sodium ions rush in and the potassium ions have begun rushing out, making the outside more positive.Which one of the following is true of the concentrations of ions inside and outside of an unstimulated neuron? A. More potassium outside than inside B. More potassium inside than outside C. More sodium outside than inside
- Which part of the neuron likely contains the most vesicles? a. Dendritesb. Cell bodyc. Nucleusd. Axone. Axon Terminal Which part of the neuron has the most voltage-gated calcium channels? a. Dendritesb. Cell bodyc. Nucleusd. Axone. Axon TerminalA person is given a drug that blocks the voltage-gated sodium ion channels in the plasma membrane of a neuron. Write: What effect would this have on the ability of the neuron to depolarize?During the rising portion of the action potential, which ions are moving across the membrane and in which direction? A. Sodium ions move out. B. Sodium ions move in. C. Both sodium and potassium ions move in. D. Potassium ions move in.