Joel is comparing two slides showing chromosomes in a sperm cell and a skin cell of a dog.  he finds that the sperm cell has 39 chromosomes. how many chromosomes can he expect in the  skin cell?

a covalent bond, specfically triple bond

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.