Several changes occur within the circulatory system to increase the delivery of oxygen to actively respiring muscle cells when the body s activity level is raised: increased heart rate;
(Several changes; occur; L:within the circulatory system; to increase the delivery of oxygen to actively respiring muscle cells) (activity level; is raised; T:when the body s)
Several changes activity level
occur is raised
L:within the circulatory system to increase the delivery of oxygen to actively respiring muscle cells
T:when the body s