Florida BIO 4301 - The tube-like object shown

1. The tube-like object shown in the simulation is the _______ of a neuron.a. axonb. dendritesc. somad. myelin sheath

2. The objects inside, outside, and moving into and out of the neuron in the simulation are:a. dendritesb. ionsc. axonsd. none of the above

3. In the simulation, when the neuron is in a resting state, there are more ___________ ions inside the neuron, andmore __________ ions outside the neuron.a. Sodium; potassiumb. Potassium; sodiumc. Total (sodium + potassium); total (sodium + potassium)

4. In the simulation, when the neuron is in a resting state, there is a ___________ charge on the inside of theneuron membrane, and a __________ charge on the outside of the neuron membrane.a. Positive; negativeb. Negative; positivec. Neutral; negatived. Positive; neutral

5. The reason for the existence and orientation of the net charge across the membrane is that:a. There are more sodium ions inside and fewer potassium ions outside the neuron.b. There are, in totality, more positive ions outside and fewer positive ions inside the neuron.c. There are more potassium ions inside and more sodium ions outside the neuron.d. There is no charge inside and positive sodium ions outside the neuron.

6. The potential chart in the simulation shows that the resting potential (the voltage across the neuron beforestimulation) is:e. – 70 mVf. zerog. - 55 mV

7. The wave moving down the neuron in the simulation represents _______ that initiates an action potential.a. sodium ionsb. potassium ionsc. a myelin sheathd. a stimulus

8. As observed in the simulation and explained in the video lesson, neurons cannot be continuously stimulatedbecause:a. A neuron needs time to return to the resting voltage between stimulations.b. Action potentials only travel at one speed.c. Dendrites govern the rate of stimulation.d. None of the above

9. When the neuron is stimulated, all of the following are observed except:a. First, sodium ions move into the neuron through sodium gated channels, then potassium ions move outthrough potassium gated channels.b. During the action potential, the neuron voltage reaches a peak of – 27 mV.c. After stimulation, it takes about 12 milliseconds (ms) for the neuron to reach its resting potential again.d. Ions are still able to move through the leak channels.

10. Which of the following are ways in which the neuron simulation is the same as the operation of a “real” neuron?a. The constant amount of time between action potentials and the constant value of peak voltage during theaction potentialb. The elements / ions moving in and out of the neuronc. The value of the resting potentiald. b and ce. all of the above