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.
A true coelom is formed within the mesoderm layer; thus, the true coelom is entirely lined with mesoderm. Both the gut and the body wall have mesodermal components. A pseudocoelom is not fully lined by mesoderm; in pseudocoelomates the mesoderm is only associated with the outer body wall, and not with the gut.Some bilaterally symmetrical organisms lack a body cavity; these are called acoelomates.evelopment of Body Cavity. All of the bilaterally symmetrical eumetazoans also have three germ layers: ectoderm, mesoderm and endoderm. The addition of mesoderm is very important; it is this embryonic tissue which gives rise to the muscular system, as well as many other adult structures.