11.5 Graded Potentials | Davenport University - Edubirdie

University:
Davenport University
Course:
BIOL 115 | Anatomy and Physiology with Human Disease I
Academic year:

2021
Views:

481

Pages:

6
Author:

Prince Sampson

11.5 Graded Potentials • Short-lived, localized changes in membrane potential – The stronger the stimulus, the more voltage changes and the farther current flows • Triggered by stimulus that opens gated ion channels – Results in depolarization or sometimes hyperpolarization • Named according to location and function – Receptor potential (generator potential): graded potentials in receptors of sensory neurons – Postsynaptic potential: neuron graded potential The Spread and Decay of a Graded Potential (1 of 3) Figure 11.10a The spread and decay of a graded potential. Graded Potentials (1 of 2) • Once gated ion channel opens, depolarization spreads from one area of membrane to next The Spread and Decay of a Graded Potential (2 of 3) Figure 11.10b The spread and decay of a graded potential. Graded Potentials (2 of 2) • Current flows but dissipates quickly and decays – Graded potentials are signals only over short distances The Spread and Decay of a Graded Potential (3 of 3) Figure 11.10c The spread and decay of a graded potential.

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