This amongst the following is found in muscle cells and nerves

The correct answer is resting potential.

To understand why this is the correct answer, let us break down the concept step-by-step:
1. Excitable Cells: Muscle cells (myocytes) and nerve cells (neurons) are classified as excitable cells. This means they are capable of generating and transmitting electrical impulses along their membranes.
2. What is a Membrane Potential? In a general sense, almost all living cells have a difference in electrical charge between the inside and the outside of their cell membrane. This electrical charge difference is known as a membrane potential. However, the term "membrane potential" is a broad category that can change dynamically (for example, during an action potential).
3. What is the Resting Potential? When excitable cells like muscle cells and nerves are at rest—meaning they are not actively transmitting or conducting electrical signals—they maintain a stable, baseline electrical charge difference across their membrane. This specific, steady-state electrical potential of an unstimulated excitable cell is called the resting potential (specifically, the resting membrane potential). In neurons, this value is typically around -70 mV, while in skeletal muscle cells, it is around -90 mV.
4. Potassium and Sodium Equilibrium Potentials: The equilibrium potential for a specific ion (such as potassium or sodium) represents the theoretical membrane potential that would establish if the membrane were selectively permeable to only that single ion. While these individual equilibrium potentials contribute to establishing the overall resting potential, they do not represent the actual resting electrical state found across the muscle and nerve cell membranes under physiological conditions.

Therefore, the stable, baseline electrical potential found in unstimulated muscle cells and nerve cells is the resting potential.