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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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