B6A11Coordinate

Electrical gradient produces a membrane potential

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: l gradients • Inside of the cell is negative relative to the outside of the cell. • Electrical gradient produces a membrane potential (voltage) Resting Membrane Potential • At equilibrium, inside of the cell membrane would have a higher [negative charges] than the outside. • Potential difference: • Na is Not allowed in; K is K ontained. – Magnitude of difference in charge on the 2 sides of the membrane.. • Depends upon 2 factors: 2 3 Cell Excitability (= Irritability) • The ability to undergo rapid changes in membrane potential in response to stimuli. – Oocytes: rapid block to polyspermy. – Neurons: conduct nerve impulses – Muscle cells: initiate contraction – Ratio of the concentrations of each ion on the 2 sides of the plasma membrane. – Specific permeability of membrane to each different ion. • Resting membrane potential of most cells ranges from - 65 to – 85 mV. Conduction of electrochemical signals in neurons • Nerves are NOT wires! • Nerve impulses are NOT electricity! • Nerve impulse ar...
View Full Document

Ask a homework question - tutors are online