Why is RMP different in different cells?

The resting membrane potential is determined by the uneven distribution of ions (charged particles) between the inside and the outside of the cell, and by the different permeability of the membrane to different types of ions.

Why is the resting membrane potential observed in a neuron more depolarized than in a skeletal muscle cell?

As the equilibrium potential for potassium becomes more positive, the resting potential becomes more positive (i.e., more depolarized). Because of the sodium influx into the cell, the equilibrium potential for sodium is changed, namely, it is less positive.

Why is the neuron’s resting potential not usually equal to the K+ equilibrium potential?

At rest the inside of a neuron is more negatively charged relative to the outside of the neuron. Though the intracellular concentration is high for potassium and low for both chloride and sodium, the resting membrane potential opposes potassium and chloride ions from diffusing down their concentration gradients.

Why do muscle cells have a negative RMP?

a negative value, which means that there is an excess of negative charge inside of the cell, compared to the outside. much depended on intracellular potassium level as the membrane permeability to potassium is about 100 times higher than that to sodium.

What is the resting membrane potential RMP of a neuron?

The resting membrane potential of a neuron is about -70 mV (mV=millivolt) – this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.

Why is the neuron’s resting potential not usually equal to the K+ equilibrium potential quizlet?

The resting membrane potential of neurons is close to but not equal to the K+ equilibrium potential because the membrane is not completely impermeable to Na+. Therefore, at rest, Na+ diffuses into the cell constantly along its electrochemical gradient as K+ diffuses out.

Why is the resting membrane potential closer to Ek than ENa?

the conductance for that ion. Vrest (~-70 mV) is much closer to EK (-80 mV) than ENa (+58 mV) because, at rest, the conductance (and permeability) of the membrane to K is much greater than that of Na.

How does a cell maintain resting membrane potential?

Resting membrane potentials are maintained by two different types of ion channels: the sodium-potassium pump and the sodium and potassium leak channels. Therefore, following the concentration gradient, the potassium ions will diffuse from the inside of the cell to outside of the cell via its leaky channels.

What is the RMP of nerve and muscle cells?

In most mammalian cells, the resting membrane potential is around −50 mV (−0.05 V). For example, in a typical neuron, its value is −70 mV, in a typical skeletal muscle cell, its value is −90 mV, and in a typical epithelial cell, its value is closer to −50 mV.