The word arteries in line 15 refers to A. vessels that are thickened and constricted B. the paths along which blood flows to all parts of the body C. the tubes carrying blood back to t
The word arteries in line 15 refers to __________ .
A. vessels that are thickened and constricted
B. the paths along which blood flows to all parts of the body
C. the tubes carrying blood back to the heart
D. such heart diseases as suffered by old people