To solve this problem, we need to determine how much oxygen is delivered to tissues by 100 ml of oxygenated blood under normal physiological conditions.$\newline \bullet$Oxygen is primarily transported in the blood bound to hemoglobin within red blood cells.$\newline \bullet$Each gram of hemoglobin can bind approximately 1.34 ml of O₂.$\newline \bullet$The average hemoglobin concentration in blood is about 15 g/dl (grams per deciliter).$\newline \bullet$Therefore, the total oxygen-carrying capacity of blood is approximately:$\newline$ - $15 \,$g/dl$\times 1.34 \,$ml O₂/g$= 20.1 \,$ml O₂/dl$\newline \bullet$However, not all of this oxygen is delivered to the tissues. Under normal conditions, about 25\% of the oxygen bound to hemoglobin is released to the tissues.$\newline \bullet$Thus, the amount of oxygen delivered to the tissues is:$\newline$ - $20.1 \,$ml O₂/dl$\times 0.25 = 5.025 \,$ml O₂/dl$\newline \bullet$This means that approximately 5 ml of O₂ is delivered to the tissues per 100 ml of oxygenated blood.$\newline$Therefore, the correct answer is Option 2: 5 ml.