Answer:
Mast Cells
Explanation:
Mast cells release histamine in the blood stream, when they detect a substance that triggers an allergic reaction, also called an allergen.
The neuroendocrine system produces and releases hormones which are basically chemicals that travel via the bloodstream to specific organs in the body to control things like heart rate, glucose release rate, etc. This is how homeostasis in maintained.
The Arctic fox is specifically made to survive extreme cold weathers, it has a very thick fur coat that keeps it very warm. Also, Arctic foxes change the color of their fur with the seasons. In winter they are white to blend in with the snow, while in the summer they change to brown. Hope this helps.
