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.
Well-adjusted barometer can help you predict changing weather day to day because it detects minute changes in the air pressure.
The wind chill index tells you D. how wind and temperature affect your body in winter. Basically, it's how you perceive the cold weather on your skin regardless of what the temperature actually is. Hope this helped!
Ocean currents bringing cooler air and mountain ranges
