How do nutrients/wastes move from blood vessels to tissues and back?

Answer 1

Capillaries, are thin-walled blood vessels in which gas exchange occurs. In the capillary, the wall is only one cell layer thick. Capillaries are concentrated into capillary beds. Some capillaries have small pores between the cells of the capillary wall, allowing materials to flow in and out of capillaries as well as the passage of white blood cells. Changes in blood pressure also occur in the various vessels of the circulatory system. Nutrients, wastes, and hormones are exchanged across the thin walls of capillaries. Capillaries are microscopic in size, although blushing is one manifestation of blood flow into capillaries. Control of blood flow into capillary beds is done by nerve-controlled sphincters.

Answer 2

Exchange usually only occurs through the capillaries (not in the larger blood vessels, the arteries or veins). Capillary walls have a single, thin layer of cells, with occasional pores, called fenestrations (from the Latin word for window!). The movement of substances is driven by a concentration gradient, so that nutrients move from an area of high concentration (the blood) to an area of low concentration (the cells), and waste moves from an area of high concentration (the cells) to an area of low concentration (the blood).

Answer 3

The circulatory system functions in the delivery of oxygen, nutrient molecules, and hormones and the removal of carbon dioxide, ammonia and other metabolic wastes. Capillaries are the points of exchange between the blood and surrounding tissues. Materials cross in and out of the capillaries by passing through or between the cells that line the capillary

Capillaries, are thin-walled blood vessels in which gas exchange occurs. In the capillary, the wall is only one cell layer thick. Capillaries are concentrated into capillary beds. Some capillaries have small pores between the cells of the capillary wall, allowing materials to flow in and out of capillaries as well as the passage of white blood cells. Changes in blood pressure also occur in the various vessels of the circulatory system. Nutrients, wastes, and hormones are exchanged across the thin walls of capillaries. Capillaries are microscopic in size, although blushing is one manifestation of blood flow into capillaries. Control of blood flow into capillary beds is done by nerve-controlled sphincters.

Answer 4

When the nutrient is brought to cell by the blood stream. It diffuses do the extra-cellular space, then is either actively transported, facilitated transport, pinocytosis, passive diffusion or across an electrochemical gradient. Most wastes are moved by passive diffusion (CO2), exocytosis, active excretion, or through an ion pump. If they are not water soluble, they need some type of carrier (protein, or proteoglycan). And this is how they are carried through the blood stream to the liver (for metabolism) or to the kidney for excretion.

Answer 5

blood cells?