- Chemicals, such as adrenalin start pumping
<span>·<span> </span></span>Heart rate goes up
<span>·<span> </span></span>Blood vessels dilate
<span>·<span> </span></span>Breathing increases
<span>·<span> </span></span>Sweat production increases
<span>·<span> </span></span>Metabolism slows down
<span>·<span> </span></span>Muscles become tense
<span>·<span> </span></span>Pupils enlarge
<span>·<span> </span></span><span>Sex hormone production goes down</span>
