Question #f6307

1 Answer
Nov 7, 2017

It is because arteries wall adjusts its diameter accordingly with the heart. It will contract and relax as per the need , if it was voluntary then we had to do the same work every time which is next to impossible, it would be like you are eating food or watching TV and your artery tells you 'Hey buddy please squeeze my walls or relax them.Hence this mechanism is involuntary.