contestada

Which of the following mechanisms are used to regulate blood pressure in the closed circulatory system of vertebrates?
I) changing the force of heart contraction
II) constricting and relaxing smooth muscle in the walls of arterioles
III) opening or closing precapillary sphincters
A. only I and III
B. I, II, and III
C. only I and II
D. only II and III

Respuesta :

Otras preguntas