The period during which a heart chamber is contracting is called

1. is geographic distribution

2 is increasing complexity

3 is transitional forms

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.  

answer/// to address the needs of adults with mental illness and increase their ability to function;