How is the taiga different from the tundra! A) Evergreen trees grow in the taiga very little plant life grows in the tundra

B) Many animals live in the taiga no animals live in the tundra

C) The taiga is very warm the tundra is very cold

D) The taiga exists around the north pole the tundra exists around the south pole

trachea, alveoli, lung capillaries, arteries

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.