What is the electrical current that travels along neurons called? A. Neurotransmitter B. Action potential C. Contractions D. Electromagnetic wave
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What is the
A. Neurotransmitter
B. Action potential
C. Contractions
D.
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- Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. GolgibodiesAfter the action potential reaches its peak, the potential across the membrane falls toward its resting level. What accounts for this recovery? a. The sodium–potassium pump removes the extra sodium. b. Potassium ions move out because their channels are open and the electrical gradient pushes them out. c. Potassium ions move out because their channels are open and the concentration gradient pushes them out. d. Potassium ions move in.What chemical is released by the axon terminals of amotor neuron at a neuromuscular junction?a. ACh c. dopamineb. serotonin d. epinephrine
- 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.A stimulus causes a change in permeability of neural membranes, which begins the process of transmitting an impulse. If the stimulus reaches the threshold potential of a neuron, an action potential is generated. Select the numbers of the statements below that occur once the threshold potential is reached. 1. Sodium ions flow into the neuron. 2. Sodium ions flow out of the neuron. 3. The membrane potential becomes positive. 4. The membrane potential becomes negative. 5. Voltage-gated potassium channels open. 6. Voltage-gated potassium channels close. 7. Potassium ions flow into the neuron. 8. Potassium ions flow out of the neuron. Place the numbers in order from the first event to the last event: andWhat determines the effect of neurotransmitter release on the post-synaptic neurons? a. the size of the action potential. b. the post-synaptic receptors c. the neurotransmitter contained in the synaptic vesicles. d. the concentration of calcium ions reached in presynaptic terminals. e. the size of the synaptic vesicles.
- Both potassium and sodium channels located along the nerve membrane are voltage-gated. This means that they respond to the changes in the voltage by opening and closing the gates to allow the ions to flow in or out of the membrane. When the threshold level is reached and depolarization occurs, how come only the sodium ions begin to rush in? a. The threshold levels for both sodium and potassium channels are equal, but sodium channels are slower to open. b. The threshold levels for both sodium and potassium channels are equal, but potassium channels take longer to open. c. The threshold level for the potassium channels is lower than the sodium channels. d. The threshold level for the potassium channels is higher than the sodium channels.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# 3Post synaptic neurons membrane potentials are less negative than resting membrane potentials when this occur A. Creates a new set point for the resting membrane potential B. Has a lower propensity to produce an action potential C. Reacts by generating action potential D. Higher chance of reaching the potential threshold
- 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.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 TerminalWhich of these terms is correctly matched with its definition ordescription?a. depolarization: membrane potential becomes more negativeb. hyperpolarization: membrane potential becomes more negativec. hypopolarization: membrane potential becomes more negative