Rate of flow of blood in lungs?

A) blood entering the lungs is at a low pressure, therefore, it flows through the lungs at a slower rate. this gives the blood time for it to be well oxygenated before it returns to the heart.

B) flow of blood in the capillaries is rapid so that gaseous exchange is fast between the air sacs and the capillaries. this allows the concentration gradient to be present.

which one is true, A or B?

Rate of flow of blood in lungs?

Proper answer is %26quot;A%26quot;

The lungs are perfused in a slow speed by low pressure chambers of the heart (the right ventricle), and there is a gradient that slows the pressure of the total volume (125 ml /sec) in such a manner, that it gives enough time to the capillary net of the lungs, for expelling CO2 and absorb oxygen...The process takes 1-2 seconds..and if the speed increases (like on the left side of the heart, left ventricle) the blood would pass the lungs capillary system so fast, that no net gas interchange could take place.

So again, the answer is A

Rate of flow of blood in lungs?

Gas exchange occurs across the alveoloar capillary respiratory memberane.

External pulmonary respiration is the exchange of gases between the alveoli and pulmonary blood capillaries. Internal tissue respiration is the exhcange of gases between tissue blood capillaries and tissue cells.. However, in each 100 ml of oxygenated blood, 1.5 % of the O2 is dissolved in th plasma and 98.5 % is carried with hemoglobin inside the red blood cells as HbO2

Rate of flow of blood in lungs?

A is correct. There are so many capillaries in the lungs that the blood flows at much slower rate than in the pulmonary artery. Its like a narrow river widening. For a given amount of water, the wider the river the slower the water moves.

That said, in the normal state, blood is essentially completely oxygenated by the time it is 1/3 of the way through the capillaries. Point being, even if the blood flow rate were increased, blood O2 saturation would still be maintained.

Rate of flow of blood in lungs?

Reson A is true