Nursing Drug Classifications

A newly developed medication for pulmonary hypertension targets blood vessels in the lungs, but does not affect blood vessels in the liver. Which of the following is most likely true of this medication?

A. It is a ligand that is specific for lung and liver blood-vessel receptors. but which is metabolized rapidly in the liver

B. It is a ligand that is specific for blood-vessel receptors in the lung but not in the liver

C. It is a receptor that is upregulated when oxygen tension in the lungs is low

D. It is a receptor that is only expressed on blood vessels in the lungs

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