it would be thermoreceptor but i think it is A) pain receptor
A positively charged ion is called cation.
A negatively charged ion is called anion.
A salt is formed by the ionic bonding of a cation and an anion.
pH is a measure of the hydrogen ion concentration in a solution.
The membrane also plays a vital function in preventing things from getting in or leaving the cell, and the second major function is that it is a factor in cell communication and cell recognition.
Your answer would be A. Phosphorus
A. Hormones
secreted directly into the blood
