15 Questions
What term describes positive changes in membrane potential relative to resting membrane potential?
Depolarization
Which of the following statements is true about depolarization?
It decreases the inside negativity of the membrane
What is hyperpolarization?
An increase in membrane potential
What does an increase in membrane potential from -70mV to -75mV represent?
Hyperpolarization
What factor changes when the membrane potential changes?
The concentrations of ions across the membrane
What is the role of chemically gated channels in response to neurotransmitters?
Open when the appropriate chemical binds
Which type of channels open and close in response to changes in the membrane potential?
Voltage-gated channels
What happens with leakage or nongated channels?
Always open
Which factor is crucial for generating a resting membrane potential?
Differences in K+ and Na+ concentrations inside and outside cells and Differences in permeability
In response to touch and pressure, which type of channels open?
Mechanically gated channels
What term describes negative changes in membrane potential relative to resting membrane potential?
Hyperpolarization
Which type of signals are long-distance signals of axons that always have the same strength?
Action potentials
What type of signals usually operate over short distances and have variable strength?
Graded potentials
What triggers graded potentials in neurons?
Gated ion channels
What term is used for changes in membrane potential when concentrations of ions across the membrane change?
Membrane permeability
Test your knowledge on how membrane potential changes and how signals are produced based on concentrations of ions and membrane permeability. Understand the terms depolarization and hyperpolarization, and learn about graded potentials in different types of signals.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
