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.
Answer:
Emy if you are new here let me tell you u can't a descriptive questionnn for 10 points u need to shoot it to 100
Answer:
A golden retriever.
Explanation:
Prototype may be defined as the member among the group that is characterized as more central than the other member of the group. Prototype can be used in the taxonomy as well as in the evolutionary history as well.
The prototype is the main representative member of the group. The golden retriever dog is the most common member among all the members listed in the question. Hence, the golden retriever (dog) is considered as the prototype.
Thus, the correct answer is option (e).
This is a True Statement.HOPE IT HELPED YOU
Lipids are made of three fatty acids bound to a glycerol molecule
