solved large temporary file folder? safe to delete? If im going to partition my used had drive with a windows 7 installation disc are my files safe from getting deleted? Can't find your answer ?
Blood Capillaries. The blood capillaries are where the important functions of the circulation take place: the exchange of material between circulation and cells. Capillaries are the smallest of the body's blood vessels. They are only one cell thick, and they are the sites of the transfer of oxygen and other nutrients from the bloodstream to other tissues in the body; they also collect carbon dioxide waste materials and fluids for return to the veins.
Gas exchange takes place in the capillaries for animals with a closed circulatory system such as birds, mammals, reptiles, and some amphibians. Remember that the capillaries are the smallest blood vessel, and they can be found near every cell in the body. With trillions of cells, that is a lot of capillaries. The respiratory apparatus in insects consists of a system of tubes, called tracheae, which directly ventilate the tissues. When an animal actively moves air to the site of gas exchange, it is called ventilation. The tubes act similarly to a closed circulatory system of blood vessels which divide and branch out into smaller and smaller tubes extending into all parts of the insect like plumbing pipes.