precapilalyr sphincter promote more exhange when open? in exercise
a. Yes, the precapillary sphincter promotes more exchange when open in exercise.
b. No, the precapillary sphincter does not promote more exchange when open in exercise.
c. The precapillary sphincter may or may not promote more exchange when open in exercise.
d. The precapillary sphincter promotes more exchange only in certain types of exercise.