Question: 150: Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver \_\_\_\_ ml of \mathrm{O}_{2} to the tissues.
(1) 4 ml
(2) 10 ml
(3) 2 ml
(4) 5 ml
Answer: Option (4)
Explanation:
Under normal physiological conditions, arterial blood contains about
20 \text{ ml} of oxygen per 100 \text{ ml} of blood.
Venous blood returning from tissues contains about
15 \text{ ml} of oxygen per 100 \text{ ml} of blood.
The amount of oxygen delivered to tissues is the difference between arterial and venous oxygen content.
Oxygen delivered =20-15 ml per 100 \text{ ml} of blood.
Oxygen delivered =5 \text{ ml}.
Therefore, every 100 \text{ ml} of oxygenated blood delivers approximately
5 \text{ ml} of oxygen to the tissues.