Answer:
Explanation:
The cell membrane separates the cell from the outer environment. The extracellular fluid contains the sodium ions (Na+), chloride ions (Cl-), while intracellular fluid contains potassium (K +) and negative anions.
The potential difference arises when the membrane is selectively permeable to some ions. The resting potential is -70mV.
When the neurons get excited, the sodium ions start to enter by sodium channels.
Now there are more positive ions inside the cell membrane. It disturbs the resting potential i.e. -70mV. This stage is known as depolarization.
When the inside environment of the cell is more positively charged, the potassium ions start to move out of the cell. It goes out by the voltage-gated channels. Thus resting stage is maintained and it is known as repolarization.
But the initial stability of the cell membrane has to be maintained. To restore the resting stage, the sodium ions start to move out of the membrane and potassium ions enter into the cells again. This is an active transport and has done by the Na+ - K+ pump. Here 3 sodium ions move out and 2 potassium ions pumped into the cell through the plasma membrane.
Thus the resting potential regains. The potassium ions come back into the cells against the concentration gradient and ATP provides the energy for this phenomena.
Because it is not the dominant allele, it is the recessive allele so it is not shown.
Answer:
Yes, the population of rabbits is in genetic equilibrium because both white and brown rabbits have equal chances of survival throughout the year. During the winter season, the brown rabbits stand out and are likely to be eaten by predators, but during the summer, white rabbits stand out and are likely to be eaten.
Explanation:
Brainliest would be appreciated!
Epithelial tissue covers the body, lins internal surfaces, and forms glands.
D an animal or plant getting a new "ability" is an example of evolution like this plant can climb now
