Answer:There is no risk-free level of exposure to secondhand smoke. Secondhand smoke causes numerous health problems in infants and children, including more frequent and severe asthma attacks, respiratory infections, ear infections, and sudden infant death syndrome (SIDS).
Circulation is provided by the cardiovascular system, including both the heart and the blood vessels. There are three major categories of blood vessels:
-The arteries (number 1) transport oxygen and nutrients to tissues.
-The veins (number 2), convey the wastes from the tissues.
-Capillaries: Only the capillaries are in close contact with the cells and allow exchanges between the blood and the interstitial fluid that bathes the cells (nutrients, gases and wastes).
I'm thinking that it increases blood flow, but don't quote me on that -- I may be wrong :/
