True or False: O2 can be carried in the blood only when attached to hemoglobin, NOT dissolved in blood plasma Solution ANS: FALSE Explanation: Oxygen Transports to Most the Tissues: Oxygen is transported two ways in the blood. They are... 1. Oxygen dissolved in the plasma 2. Oxygen bound to hemoglobin (Hb) Total blood oxygen content = Amount dissolved in plasma + Amount bound to hemoglobin.