| Question |
Answer |
| What is the definition of Threshold Stimulation? | the minimum DEPOLARIZATION required to trigger a Na+ permeability change --> AP |
| What is the definitions of Subthreshold? | Insufficient DEPOLARIAZATION for a response |
| T/F The lower the amplitude of an AP the less likely it is to reach the synapse. | F. All-or-None Principle - AP attains FULL amplitude (30mv at 1ms) or it does not occur |
| What is Hyperpolarization? | MORE negative RP --> decreased membrane excitability |
| What are some of the causes of Hyperpolarization? | 1. INTERFERENCE with Na+ INFLUX; 2. INCREASED Extracellular Ca++
|
| What medicine causes Hyperpolarization and what is its function? | Lidocaine - interference with Na+ INFLUX - anesthesia |
| What is Depolarization? | LESS negative RP --> INCREASED membrane Excitability |
| What are some causes of Depolarization? | 1. ENHANCEMENT of Na+ INFLUX; 2. DECREASED Extracellular Ca++ |
| What is Paresthesia? | Increased membrane permeability |
| What is a side effect of Paresthesia? | Abnormal Sensation, Hallucination, Hearing Things, Schizo |
