Depolarization means that the inside of the membrane is beco…

Depolarization means that the inside of the membrane is becoming more [positive] compared to resting membrane potential. When the membrane is stimulated, Na+ channels [open] and Na+ rushes [into] the cell.  This causes [depolarization].  When the charge inside the cell reaches +30 mvs, the Na+ channels [close] and the K+ channels [open].  K+ rushes [out] the cell.  Finally the Na+/K+ pump uses [ATP] to move Na+ back [outof] the cell and K+ back [intoa] the cell.

The skin plays a large roll in maintaining homeostasis of bo…

The skin plays a large roll in maintaining homeostasis of body temperature.  The temperature range for homeostasis is housed in the [brain]. When body temperature is too [high], blood is shunted towards the [skin] and heat dissipates across the surface of the body into the atmosphere. When body temperature is too [low], blood is pulled back internally to protect the more important organs.  This leaves the extremities, like the [fingers], with less blood.