Three species of lizards of the genus Gallotia are found on the Canary Islands, a chain of seven volcanic off the west coast of Africa. The easternmost island, Lanzarote, is the oldest, while the
westernmost island, El Hierro, is the youngest. The distribution of lizard species is shown on the
map below.

trachea, alveoli, lung capillaries, arteries

the answer is d. none of the above

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.