Capillaries

So they can diffuse their nutrients into the interstitial space between cells and allow red blood cells, one by one, through. They can be so small that a single red blood can travel in and out easily.

These thin walls are whats called semi-permeable. As mentioned before they let certain things in and certain things out. For example within the alveoli in the lungs gas exchange takes place. The semi-permeable membrane walls of the capillaries allows o2 (oxygen) into the blood and they will let out co2 (carbon dioxide)

No, arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries are where blood disperses throughout areas in the body. capillaries are sort of in between, but not really.

Continous capillaries contain tight junctions and are less "leaky " than fenestrated capillaries. They only allow the movement of water and small ions, whereas fenestrated capillaries contain many fenestrae or pores and allow many molecules with the exception of medium and large proteins to pass

Arteries,veins and capillaries are the blood vessels which help in transporting blood from one organ to another organ.

Capillary density within tissues varies directly with tissues' rates and metabolism.

Venous blood glucose level will be approximately 10-15% higher.

Continuous-Fenestrated-Sinusoids Capillaries

D.

capillaries are found in muscle, skin, lung, central nervous system, and other tissues, and characterized by an uninterrupted endothelium, a continuous basal lamina, fine filaments, and numerous pinocytotic vesicles.
All over your body.

astrocytes

Capillaries connect the smallest branches of arteries and veins The walls of capillaries are just one cell thick. Capillaries therefore allow the exchange of molecules between the blood and the body's cells - molecules can diffuse across their walls. This exchange of molecules is not possible across the walls of other types of blood vessel.

No, broken capillaries will not go away on their own. There is an easy way to get rid of them, but it is not for the squeamish. Use a very sharp blade of some sort to make a small incision into the capillary. You will know if you got it, because blood will gush out (not heaps of blood, just more than would come out if you had made an incision on a normal part of skin without a broken capillary). Then wait for the cut to heal, and your broken capillary will be gone.

To increase the surface area of which the products of digestion can diffuse across (into the blood)

The walls of capillaries are made of one cell cell layer so it is a small diffusion barier. They have the greatest total cross-sectional area and the slowest velocity of blood flow. This enhances exchange.

Arteries carry oxygenated blood away from the heart, to the cells that need them.

Veins carry blood containing carbon dioxide back to the heart after the oxygen has been given to the cells.

Capillaries are the thinnest arteries and veins. They are only one cell wide. As the blood cell passes through the very thin capillary, the cells on either side are given oxygen and carbon dioxide is taken from them. Therefore, the capillaries connect the arteries and veins.

Veins are thinner than arteries. Arteries are thicker than capillaries.

Capillary in the villi are used to absorb the digested food and transport the food the the destination cell.

Pressure at capillary bed varies from 32mmHg at the arteriolar end to about 10mmHg at venous end, with an average of 17mmHg

In the body, capillary tubes are in fact microscopic. However, the capillary effect can be viewed on a much larger scale. If one was to place a straw in a glass of water, one would see that the water level in the straw is higher than that of the glass of water, this is because the molecules of water are attracted to the wall of the straw, and each other.

Blood leaves the glomerular capillaries via a second set of arterioles, the efferent arterioles, which deliver blood to the peritubular capillaries.

Veins are bigger (:

It is unique from other capillary beds in that it is supplied with and drained by arterioles, the afferent arteriole and efferent arteriole, respectively.

Cardiac Vein

Capillaries are very small blood vessels which act as the transporting medium between the oxygenated blood in the arteries (excluding the pulmonary) and the deoxygenated blood in the veins. As they are so small of approximately 5-20 micro-metres in diameter, they do not need valves, as there is a distinct flow from the arterioles supplying the capillary with blood, and the venules draining the capillary within the double circulation.

Capillaries are tiny thin-walled blood vessels that connect the smallest arteries and veins and allow the exchange of nutrients and waste between the blood and tissues. Oxygen and carbon dioxide are exchanged between the circulatory and respiratory systems; oxygen diffuses from the lungs into the bloodstream and is transported by erythrocytes (red blood cells) throughout the body. Carbon dioxide diffuses out of the blood into the alveoli and goes the reverse direction through the respiratory system and out the nose.

The walls of capillaries are very thin allowing the nutrients of cells to diffuse through them. They facilitate the diffusion of nutrients to the body by passing them through their cell walls.