15 Questions
What does the Nernst potential represent?
The membrane voltage at which a particle moves into and out of the cell at the same rate
Which of the following best describes the Nernst equation?
An equation that calculates the balance of charged particles across a membrane
What factors does the Nernst equation take into account?
Diffusional forces, electrical fields, charge of the particle, and the ratio of the particle's concentration intracellular:extracellular
Why is it helpful to understand Nernst potentials?
To understand cellular signaling
Why is there an unequal distribution of sodium and potassium across the membrane?
Maintenance of negative charge inside the cell
What is the Nernst potential for potassium?
About -90 mV
What does the Goldman Field equation predict?
The membrane potential based on the relative permeability of the membrane to sodium, potassium, and chloride
What is the membrane potential of a neuron?
About -75 mV
Why is the membrane potential of a neuron close to, but not the same, as the equilibrium (Nernst) potential for potassium?
The membrane potential is determined by the flow of other ions and not just potassium
What does the Goldman Field equation relate the membrane potential to?
The relative permeability of the membrane to sodium, potassium, and chloride
Which forces are involved in the filtration of substances through a capillary?
Osmotic pressure and hydrostatic pressure
Which forces are involved in the distribution of ions across a membrane?
Electrostatic forces and concentration gradient
What does the variable Lp represent in the simplified Starling forces equation?
Leakiness of the capillary wall to water
What does the variable P represent in the simplified Starling forces equation?
Hydrostatic pressure
What does the variable π represent in the simplified Starling forces equation?
Osmotic pressure
Test your knowledge on the forces at play in physiological processes such as filtration and ion distribution. Explore how these forces interact and determine the direction of substance movement. Get familiar with Starling forces and their significance in physiology.
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