Answer:
Dopamine
Explanation:
It's not adrenaline since that's the flight or fight chemical your body releases in cases of danger and meth has nothing to do with it.
It's not THC since that's the chemical in marijuana that gives you the dopamine rush, which is unrelated to meth
It's not Hormones, this one just doesn't make sense.
it is TRUE that our immune systems don't work as well when as well when we're under psychological stress.
Answer:
This is due to the property of contractility.
The cells in the heart need a constant supply of nutrients / oxygen and to get rid of their waste products ans that why it needs its own special circulatory system.
