What is the most effective method of first aid when a young child has a fever?

Water

Explanation:

Reduce thier temperature, Remove excess clothes and give them fluids such as water or diluted juice.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.