What are some similarities and differences between how mammals and other kinds of animals reproduce?

thats not a question

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 increasing the intensity, duration,and frequency of exercise progressively;