Figure 5.

Hypo-osmotic stress prevents relaxation of isometric arteries to K⁺. In arteries where raising [K⁺]_o from 5.88 to 10.58 mM produced relaxation, relaxation to K⁺ was abolished in the presence of 30 μM Ba²⁺ or a hypo-osmotic solution (40 mM NaCl omitted). (b) Mean data (n=2±s.e.mean).