A 19-year old man presents to the ED after rolling his left ankle playing basketball earlier in the evening. X-rays of the ankle do not reveal a fracture. The exam reveals a positive anterior drawer test with no endpoint on the left. Which of the following is the most likely diagnosis?A. Achilles' tendon rupture
B. Grade 1 tear of the calcaneofibular ligament
C. Grade 2 tear of the deltoid ligament
D. Grade 3 tear of the anterior talofibular ligament

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explanation:

the answer is d. chordata

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.