Mariana’s teacher has asked her to determine the type of a sample of blood. after doing some tests, she has learned that the red blood cell of the sample has no antigens on it and that the plasma contains both a and b antibodies. what is the type of the blood sample?

d

explanation:

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.