If a person is unresponsive, what should you do first in cpr?
a)ask someone to call 911, or call 911 yourself
b)begin doing chest compressions at a beat of 100 per minute
c)tilt the head back before performing mouth-to-mouth
d)use an aed device to administer one shock to the chest

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.