They are not really red and blue. This is seen in preserved animals (and cadavers) and in drawings to show which are higher in oxygen (red) and lower (blue). In general, you also can see than veins are shown in blue and arteries are red.
Capillaries have spaces between endothelial cells to allow for the exchange of gases, nutrients, and waste products between the blood and surrounding tissues. This structure, known as intercellular clefts, facilitates the transfer of substances through the capillary wall.
Red fuel containers are for gasoline. Blue are usually for diesel fuel. Some water containers are also made blue and look sort of like gas cans, so check to make sure it is actually meant for fuel before filling it. Otherwise the plastic might turn out to be not fuel-resistant and melt.
Red blood cells release oxygen molecules in the capillaries of body tissues where they are needed for cellular respiration. The oxygen diffuses from the red blood cells into the surrounding tissues due to the concentration gradient between the red blood cells and the tissues.
Capillaries are very thin blood vessels. Oxygen and nutrients and hormones can pass through the walls of the capillaries and reach the body's cells, while red blood cells remain in the capillaries.
capillaries
The capillaries are in between the red and blue veins :)
the color
The only difference is the colour of the external shell.
Simple one is a black-red star and the other is black-blue star. The only difference is the color.
Wall thickness
There really is no difference. Maybe different brands made them. But Land-o-Lakes does make both blue and red caps...
Wavelength Frequency and Photon Energy
Cap color...nothing more.
The difference between a blue nosed pitbull and a red nosed pitbull has nothing to do with their nose it is the colour of their fur and akin. 'Bluenose' pitbulls are grey where as 'Rednose' pitbulls are brown.
The differences between red and blue light are Red stands for n00b and blue stands for b00b! your mum
They're spelled differently.
The red pet means they had a bad life and the blue one means they had a good one. :)