Which muscle type has the ability to cause blood vessels to dilate and constrict?

Answer;

Smooth muscles

Explanation;Smooth muscles are the muscles that cause blood vessels to dilate and constrict. Smooth muscles forms the supporting tissues of the blood vessels and hollow internal organs such as intestines, bladder, etc.Hormones such as vasopressin and Norepinephrine trigger the contraction of smooth muscles and thus constricting the blood vessels.  When these hormones production is stopped then the smooth muscles will relax and thus dilating the blood vessels.

It won't lose or gain electrons if it's a covalent bond it shares the electrons with another atom or atoms. if it is an ionic bond it will lose the 3 electrons on the outer shell and become a positively charged ion.  credit goes to @sunshinebaby of answers.yahoo.com.

Hypothesis. why don’t you know this? i learned this stuff in like 5th grade