Figure 16-20 Shows the Pathway Through Which Nitric Oxide (NO)

Figure 16-20 shows the pathway through which nitric oxide (NO) triggers smooth muscle relaxation in a blood vessel wall.Which of the following situations would lead to relaxation of the smooth muscle cells in the absence of acetylcholine? Figure 16-20

A) a smooth muscle cell that has a defect in guanylyl cyclase such that it cannot bind NO
B) a muscle cell that has a defect in guanylyl cyclase such that it constitutively converts GTP to cyclic GMP
C) a muscle cell that has cyclic GMP phosphodiesterase constitutively active
D) a drug that blocks an enzyme involved in the metabolic pathway from arginine to NO