The opening of which of the following types of ion channels will lead to a depolarization? A chemically gated sodium channel 2) a voltage gated sodium channel 3) A mechanically gated sodium channel 4) All of them

The opening of a voltage gated sodium channel will lead to a depolarization.

Explanation:

When the membrane potential of the membrane reaches the threshold of -55mV - due to action potential or summation of smaller action potentials- the sodium channels in the membrane rapidly open causing rapid depolarization of the cell membrane as sodium ions rush across the membrane into the cell. This is an example of how electric impulse is carried across a neuron. When the membrane potential reaches into the positive,+ 33mV, the membrane is completely depolarized and energy is required to pump out the sodium ions to regain the -70mV resting membrane potential.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

i believe it is a.) released into

explanation: