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Cell Membrane Transport Mechanisms Study Guide

This guide provides a comprehensive overview of ion channels, their diverse gating mechanisms, and their essential functions in cellular communication and electrical signaling. It covers the resting membrane potential, action potentials, and the mathematical principles governing ion movement, such as the Nernst equation. The content is suitable for students and professionals in biology, physiology, and related fields seeking to understand the molecular basis of cellular excitability.

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Cell Membrane Structure and Function

Cell Membrane Structure and Function

An overview of cell membrane structure, phospholipid bilayer composition, and the roles of cholesterol and proteins in selective permeability and electrical signaling.

  • cell membrane structure
  • phospholipid
  • cholesterol
  • membrane fluidity
  • integral proteins
  • peripheral proteins
  • fluid mosaic model
  • selective permeability
  • passive transport
  • active transport
  • ion channels
  • G-protein coupled receptors
  • Nernst equation
  • resting membrane potential
  • action potential

Mechanisms of Membrane Transport

Mechanisms of Membrane Transport

Membrane transport involves moving solutes down or against electrochemical gradients through simple diffusion, facilitated diffusion, or active transport.

  • Selective permeability
  • Simple diffusion
  • Facilitated diffusion
  • Passive transport
  • Active transport
  • Primary active transport
  • Secondary active transport
  • Cotransport (Symport)
  • Countertransport (Antiport)
  • Fick's Law of Diffusion
  • Sodium-potassium pump
  • Electrogenic transport
  • Saturable kinetics

Ion Channels, Membrane Potentials, and Action Potentials

Ion Channels and Gating Mechanisms

Ion channels open, close, or inactivate through leak, voltage-gated, ligand-gated, or mechanically gated mechanisms to regulate membrane potential and electrical signals.

  • Leak channels
  • Voltage-gated channels
  • Ligand-gated channels
  • Mechanically gated channels
  • Resting membrane potential
  • Action potential
  • Potassium efflux
  • Mechanotransduction
  • Sodium channels
  • Calcium channels

Cellular Signaling and Membrane Potentials

This topic covers chemical signaling ligands, G-protein coupled receptors, membrane potentials, the Nernst equation, and the phases of the action potential.

  • Chemical signaling ligands
  • G-protein coupled receptors (GPCR)
  • Signal transduction amplification
  • Membrane potential
  • Resting membrane potential
  • Sodium-potassium ATPase
  • Nernst equation
  • Equilibrium potential
  • Driving force
  • Chord conductance
  • Action potential phases
  • Depolarization
  • Repolarization
  • Hyperpolarization
  • Graded potentials
  • Threshold
  • All-or-none principle
  • Absolute refractory period
  • Relative refractory period
  • Saltatory conduction

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