9.La presión atmosférica tiene un valor aprosimado ds 1x10^5 Pa, Que fuerza ejerce el aire confinado en una habitación sobre una ventana de 50 cm x 75cm? ​

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.