If the Na+ voltage-gated channels in a muscle cell open, the Na (sodium) ions rush inside the muscle cell and makes the cell more positive as Na ions carry positive charge on it. Due to the entry of positively charged ions inside the cell, the cell becomes less negative and more positive. This is called depolarization of cell.
i believe the answer is a new source of fresh water
3.
I took this last year so yea
The nurse could say that using a central venous catheter is better for prolonged patients because the regular peripheral IV should be changed every 72 to 94 hours. It will be also be better to use this with large dosages of IV, fluid and medicine.
Environmental and Genetic factors are both incredibly complex structures, but all will create mutations of the species. The genetic variability created by mutations will be tested by natural selection, which can and will determine which characteristics are inherited in a population over time.