Question

How much oxygen is delivered by 100ml of oxygenated blood to the tissues under normal physiological condition
(a) 15ml
(b) 10ml
(c) 5ml
(d) 2.5ml

Answer 1

**** In 100% of oxygenated blood it delivers approximately 5% of oxygen to the tissues under normal conditions. For Ex. 1000ml of oxygenated blood can deliver 50ml of oxygen to the tissues under normal physiological conditions.

Complete answer:

Blood with oxygen is carried from the lungs to the heart, which pumps blood to all the parts of the body through the arteries. It is carried by RCB in the blood. 100ml of oxygenated blood can deliver 5ml of oxygen to the tissues under normal physiological conditions.

The supply of oxygen by the blood to tissues can be decreased under diseased conditions or hypoxia conditions.

Additional information:

-Blood that comes out from various tissues contains less oxygen (deoxygenated blood) than the blood which is pumped out of the heart.

- RBC in the blood contains hemoglobin which is isolated into the heme part and globulin part. It is a red iron-containing pigment which provides red colour to the blood.

- One iron molecule is present at the center of the heme which can combine with one oxygen.

- 97 percent of oxygen is carried by RBC in the blood and the remaining 3 percent of oxygen is carried via blood plasma in a dissolved state.

- Each hemoglobin molecule can carry 4 oxygen molecules.

- Binding of oxygen to hemoglobin mainly depends upon the partial pressure of oxygen.

- At the lungs partial pressure of oxygen is high so it binds to hemoglobin and becomes oxyhemoglobin. This is called oxygenation of hemoglobin.

- In tissues, the partial pressure of oxygen is low, so oxyhemoglobin dissociates into oxygen and hemoglobin.

- 100ml of oxygenated blood can deliver 5ml of oxygen to the tissues under normal conditions.

- 100ml of deoxygenated blood can deliver 4ml of carbon dioxide in the lungs.

So, the correct answer is '5ml'.

Notes:

- Other factors that influence the binding of oxygen to hemoglobin are partial pressure of carbon dioxide, concentration, temperature, and the hydronium ion.

- Hemoglobin has a higher affinity for carbon dioxide than oxygen.

- It has a higher affinity for carbon monoxide than carbon dioxide.