00:01
Hello students, for the first question here, types of cells affected by changes in membrane potential.
00:29
In this case, the neurons and muscle cells including the skeletal, cardiac and smooth muscles are affected by changes in membrane potential.
00:57
For the second question, effect of changes in membrane potential on skeletal muscle excitability.
01:29
In the case of jb with the serum potassium level of 6 .2 molper liter that is hyperkalemia, the increased extracellular potassium concentration can affect the resting membrane potential of cells including skeletal muscle fibers.
01:46
So in the case of resting membrane potential that is rmp, hyperkalemia tends to depolarize the resting membrane potential.
02:19
The rmp is essential for maintaining the excitability of muscle cells.
02:23
If the rmp is disturbed, it can affect the threshold for action potential generation.
02:30
Second, in the case of excitability of skeletal cells or skeletal muscles, the excitability of skeletal muscle fiber is influenced by the balance of potassium and sodium ions across the cell membrane.
03:08
Hyperkalemia can lead to depolarization, making it easier for the muscle cells to reach the threshold for generating action potentials.
03:17
This increased excitability can manifest as muscle cramps and weakness.
03:24
For the third question, regarding the likelihood of cardiac arrest during or between heartbeats...