Which ion channels mediate the falling phase of an action potontial?

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?