Prompt: You are a carbon atom and you have just been exhaled out of a deer. Describe the journey that you have been on or describe your new adventures. You should include
at least 10 things that you have learned in Unit 4 (cellular respiration, photosynthesis,
carbon cycle, etc).

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.