From lung to tissue 02 transpoed is:
**Core Concept**
The correct answer revolves around the concept of oxygen transport from the lungs to the tissues, involving the hemoglobin molecule in red blood cells and the oxygen-hemoglobin dissociation curve.
**Why the Correct Answer is Right**
Oxygen transport from the lungs to the tissues occurs through the process of diffusion, where oxygen diffuses from the alveoli into the red blood cells. The oxygen binds to the hemoglobin molecule, forming oxyhemoglobin. The oxyhemoglobin then binds to myoglobin in the tissues, releasing oxygen and allowing it to diffuse into the tissue cells. This process is facilitated by the Bohr effect, which states that an increase in CO2 and a decrease in pH (acidity) cause a right shift in the oxygen-hemoglobin dissociation curve, making it easier for oxygen to be released to the tissues.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the primary mechanism of oxygen transport from the lungs to the tissues.
* **Option B:** This option is incorrect because it is not a correct description of the process of oxygen transport; it seems to be a vague statement without any scientific basis.
* **Option C:** This option is incorrect because it does not accurately describe the specific process of oxygen transport from the lungs to the tissues, although it does refer to a related concept.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the oxygen-hemoglobin dissociation curve is a sigmoid-shaped curve that shows the relationship between the partial pressure of oxygen and the saturation of hemoglobin with oxygen. A right shift in the curve indicates that oxygen is more easily released to the tissues.
**Correct Answer: C. Diffusion and the Bohr effect facilitate oxygen transport from the lungs to the tissues.**