Which of the following properties of smooth muscle helps us to understand why, as pregnancy advances, women get more and more Braxton-Hicks (smooth muscle) contractions in the uterine wall?

A. Smooth muscle cells contract in response to changes in pH.
B. Smooth muscle cells contract in response to NO.
C. Smooth muscle cells contract in response to stretch.
D. Smooth muscle cells contract in response to CO2.


Answer: C

Anatomy & Physiology

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