Answer:
C
Explanation:
The Brain is located in the head and is the hub of the entire nervous system
Increasing extracellular K+ increases the positive charge outside the cell, making the inside of the cell (membrane potential) more negative. This inhibits net diffusion of Na+ into or out of the cell.
It is positive feedback mechanism
Because the nerves in your skin shoot a message of pain to your brain. The brain then sends a message back telling the muscles in your hand to pull away.
Hope it helped. :)
