It is contaminated from the alcohol swab.
The first drop of blood is wiped away because it is mainly just tissue.
It is contaminated from the alcohol swab.
It is contaminated from the alcohol swab.
Wipe it away.
The afferent arteriole supplies blood to the capillaries in the glomerulus of the kidneys. The efferent arteriole takes the blood away from the glomerulus.
The first drop of blood is diluted with the alcohol wipe that was put over the tip of your finger; the alcohol may also interfere with the iron content test. To get an accurate reading, the first drop is wiped away and fresh blood is collected.
Capillaries send blood to both arteries and veins.
The hepatic portal vein. It goes from the stomach to the liver and has a capillary net at both ends.
Capillaries are typically dark purple, because they are so far away from the point where they were oxygenated, and the redness in blood is caused by oxygen being present in the blood. But capillaries can be dark red when they are delivering blood.
The pulmanary vein. It comes out of the Right ventricle (heart) and goes to fill the capillary bed in the lungs. Actually it isn't strictlly true to say it opens into a capillary as there are venules before the capillaries. It also is the only vien that conducts blood away from the heart and not towards it.
Dallas
Arteries carry blood away from the heart, veins carry blood to the heart, and capillaries branch off of arteries and veins. Capillaries are essentially min-arteries and min-veins.