Which type of rock is loosely held together? 1. Graphite 2.Igneous 3.Metamorphic 4.Sedimentary

Serpentine minerals are made of tiny sheets of silica tetrahedrons that are loosely held together.

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.