Lecture

Electricity in Cells

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In course

BIO-244: Physics of the cell

Living organisms evolve in a physical world: their cells respond to mechanics, electricity and light. In this course, we will describe the behavior and function of cells using physical principles. ...

Description

This lecture aims to understand the physical basis of signal propagation in neurons, focusing on the setup of membrane potential, Nernst potential, and the coordination of pumps and channels. It explores the generation of electrical signals in cells, the establishment of transmembrane potential, and the modeling of voltage-gated ion channels. The lecture delves into the equilibrium state of cells, the energy needed for ionic gradients, and the role of ion channels in muscle contraction. Additionally, it discusses the modeling of the membrane as an electrical circuit, including capacitance and the change in membrane potential. Overall, the lecture provides insights into the fundamental principles of electricity in cells.

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Instructor

Alexandre Louis André Persat

Expertise bacterial biophysics and bioengineeringmicrofluidicscellular biomechanics Teaching & PhD PhD Students Jann Lukas Ledergerber, Dea Mariette Müller, Marin Paul Geoffroy Marie Ollagnon, Han-Yi Huang, Alice Pellegrino, Shiro Otaki, Chia-Ni Tsai, Po-Long Hsiao Past EPFL PhD Students Lorenzo Anton-Louis Talà, Xavier Pierrat, Tamara Rossy, Alice Cont, Jeremy Wong, Sourabh Monnappa Kuppanda Jafri, Tania Distler Past EPFL PhD Students as codirector Gabriele Gambardella Courses Fluid mechanics (for SV)

Official source

Ontological neighbourhood

Biology

Cell biology: Neurotransmission

Related concepts (32)

Voltage-gated ion channel

Voltage-gated ion channels are a class of transmembrane proteins that form ion channels that are activated by changes in the electrical membrane potential near the channel. The membrane potential alters the conformation of the channel proteins, regulating their opening and closing. Cell membranes are generally impermeable to ions, thus they must diffuse through the membrane through transmembrane protein channels. They have a crucial role in excitable cells such as neuronal and muscle tissues, allowing a rapid and co-ordinated depolarization in response to triggering voltage change.

Ion channel

Ion channels are pore-forming membrane proteins that allow ions to pass through the channel pore. Their functions include establishing a resting membrane potential, shaping action potentials and other electrical signals by gating the flow of ions across the cell membrane, controlling the flow of ions across secretory and epithelial cells, and regulating cell volume. Ion channels are present in the membranes of all cells. Ion channels are one of the two classes of ionophoric proteins, the other being ion transporters.

Membrane technology

Membrane technology encompasses the scientific processes used in the construction and application of membranes. Membranes are used to facilitate the transport or rejection of substances between mediums, and the mechanical separation of gas and liquid streams. In the simplest case, filtration is achieved when the pores of the membrane are smaller than the diameter of the undesired substance, such as a harmful microorganism.

Resting potential

A relatively static membrane potential which is usually referred to as the ground value for trans-membrane voltage. The relatively static membrane potential of quiescent cells is called the resting membrane potential (or resting voltage), as opposed to the specific dynamic electrochemical phenomena called action potential and graded membrane potential. Apart from the latter two, which occur in excitable cells (neurons, muscles, and some secretory cells in glands), membrane voltage in the majority of non-excitable cells can also undergo changes in response to environmental or intracellular stimuli.

Membrane potential

Membrane potential (also transmembrane potential or membrane voltage) is the difference in electric potential between the interior and the exterior of a biological cell. That is, there is a difference in the energy required for electric charges to move from the internal to exterior cellular environments and vice versa, as long as there is no acquisition of kinetic energy or the production of radiation. The concentration gradients of the charges directly determine this energy requirement.

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