The Board of the Philadelphia Parking Authority has changed the time for the regularly scheduled Board Meetings for 2017. Each Board Meeting will now be held at 10:00 am in the Board Room of the Authorityâs Headquarters, 701 Market Street, Suite 5400, Philadelphia, PA 19106.
A hyperpolarization or depolarization event may simply produce a graded potential, a smallish change in the membrane potential that is proportional to the size of the stimulus.
When the threshold voltage is reached, which is typically at -55 mV, the ion channels open in order to allow positive charges to rush inside the cell. This is known as depolarization, which is the process of becoming positively charged. After a cell depolarizes, it will eventually reach a maximum positive charge.