Question

a stimulus will open ion channels that will allow ____ to flow into the neuron, causing the inside to become ____ charged.
a sodium: negatively
b sodium: positively
c potassium: negatively
d potassium: positively

Explanation:

When a stimulus reaches a neuron, voltage - gated sodium channels open. Sodium ions ($Na^+$) flow into the neuron. Since sodium ions are positively charged, the inside of the neuron becomes positively charged, a process called depolarization.

Answer:

B. sodium; positively