Separate plasma by centrifugation. Transfer the serum, plasma or whole blood to a plastic transport tube (see Pediatric Specimen Tubes below). To prevent injury and exposure to potentially infectious material, do not ship frozen serum, plasma, or whole blood received in glass tubes or SST (glass or plastic).
The capillaries are the smallest of the blood vessels and are part of the microcirculation. The capillaries have a width of a single cell in diameter to aid in the fast and easy diffusion of gases, sugars and nutrients to surrounding tissues.fter travelling from the aorta, blood travels through peripheral arteries into smaller arteries called arterioles, and eventually to capillaries. Arterioles help in regulating blood pressure by the variable contraction of the smooth muscle of their walls, and deliver blood to the capillaries.
Osculum is single, large body opening at the top for water & wastes to leave. Spongocoel is the body cavity of sponges. Have only 2 cell layers (ectoderm & endoderm) separated by jellylike material. Flagellated cells called choanocytes or collar cells line their internal body cavity. Flagella of choanocytes beat & pull in water containing food which the collar traps.