Practice Questions

• Which of the following describes what happens when a neuron sends a signal?

  The neuron goes from being negatively charged to briefly being positively charged, and finally returns to being negatively charged again. The magnitude of the negative charge is fixed regardless of the strength of the input signal it receives.

  ALL OR NOTHING RESPONSE
• If a body does not have enough potassium, how might that affect neuronal firing?

  The neurons will struggle to fire because there will not be enough positively charged ions to trigger the firing of the neuron
• At a synapse, neurotransmitters released by the sending neuron do which of the following?

  They bind to receptors at the receiving neuron, which opens ion channels
• Waking up frequently, loud snoring, silent pauses in breathing, and sleepiness during the day are symptoms of?

  Sleep apnea