Nathan loves running long distances and often describes his runner's high. The phenomenon of runner's high is associated with the body's production of ____.
histamines
androgens
catecholamines
endorphins
Answer: endorphines
Nathan loves running long distances and often describes his runner's high. The phenomenon of runner's high is associated with the body's production of ____.
histamines
androgens
catecholamines
endorphins
Answer: endorphines