Table of Contents
Why are Rbcs larger in venous blood?
To enable the maximum O2 saturation of hemoglobin, red cells are shaped like biconcave disks. The shape provides more surface area for exposure of hemoglobin to dissolved oxygen. Red blood cells are also able to change shape to permit passage through small capillaries that connect arteries with veins.
Is venous blood thicker than arterial blood?
They pulse with each heartbeat (which is why your pulse is taken from an artery) and have thicker walls. Veins experience much less pressure but must contend with the forces of gravity to get blood from the extremities back to the heart.
What is more in venous blood than arterial blood?
Compared to arterial blood, there was a significant increase of erythrocyte count (2.7\%) and haematocrit (3.1\%) in the venous blood. The total and large leucocyte counts were significantly higher (9.2\% and 12.6\%, respectively) in the fingertip blood than in the venous blood.
Why would capillary blood have slightly different results than venous blood?
It is well known that capillary blood has higher hemoglobin and hematocrit values than venous blood. Water is leaving the capillaries during the passage through the capillary and gets absorbed afterwards in the venules again.
What is the difference between arterial and venous?
Arteries are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation.
How can you tell the difference between arterial and venous ABG?
As discussed earlier, a VBG gives you the same information as an ABG. However, this information is going to be different since it’s obtained from the venous as opposed to the arterial side. The most obvious difference will be in PO2 which, of course, will be markedly lower in the venous side than in the arterial side.
Why does MCV increase in megaloblastic anemia?
In these instances the peripheral blood smear may show a mixed population of microcytic and macrocytic RBCs with an elevated distribution width. In cases of macrocytosis related to alcoholism the elevated MCV may be due to the direct effect of the alcohol, liver disease and/or folate deficiency.