What do your muscles need during exercise that blood brings? what waste product (produced during aerobic respiration) does the blood carry away?

Muscles need oxygen, for aerobic respiration to occur, so the muscles can obtain a supply if energy. the waste product is lactic acid which is produced when their is not enough oxygen for aerobic respiration to occur.

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey