If the glomerular filtration rate is too high, the macula densa sends a message tothe afferent arteriole. What is the effect of this message?

A.Granular cells of arteriole walls release renin.

B.Afferent arteriole dilates.

C.It inhibits the action of ATP and adenosine on the afferent arteriole.

D.Afferent arteriole constricts.

正确答案：Afferent arteriole constricts.