Question

why does na enter the cell during the action potential? a. because the na channels are open and only let na move from outside to inside b. because the action potential pulls positive ions into the cell while na and k channels are open c. because na channels are open and allow na ions to move down the length of the axon to produce neurotransmitter at the axon terminal d. because na channels are open and there is a higher concentration of na outside of the neuron than inside

Answer 1

Answer: D. Because Na+ channels are open and there is a higher concentration of Na+ outside of the neuron than inside.

Step-by-step explanation:

Since the concentration of Na+ is higher outside of the neuron a concentration gradient is formed causing the Na+ to rush into the cell to create homeostasis or a balanced concentration.