سوال ۱۲ کنکور ارشد مدیریت ۱۴۰۰

Passage summary: The passage discusses smoking and disorders involving circulation. It describes effects on blood vessels and oxygen transport, linking these effects to problems affecting the brain and breathing.

Complete blank 12:

(11) .......... in the bloodstream causes blood vessels to contract, thus (12) .......... circulation, which eventually leads to hardening of the arteries.