PHYSIOL 1 Lecture Notes - Lecture 23: Solution, Anemia, Bone Marrow Failure
Document Summary
Single celled organism rely on diffusion for delivering nutrients and removing wastes system. In multi-cellular organisms diffusion is too slow, therefore. Function of the circulatory (cardiovascular) system: delivery substances must be transported via bulk flow the blood can travel throughout the body to deliver the substances to cells. Bulk flow- diffusion of substances into the blood so then. Blood: medium to carry substances throughout the body. Heart: mechanical pump, creates driving force that moves. Blood vessels (vasculature): structures carrying blood the blood (bulk flow) throughout the body. The cardiovascular system is composed of 3 components. Formed elements: cells and platelets (cell fragments) Formed elements comprise 45% of blood volume. Rbcs make up nearly all this volume. Plasma proteins: constitute most of solutes by weights. Oncotic pressure (osmotic force that helps hold water in the bloodstream) Make up more than 99% of blood cells. Bi-concave disk (donut where hole doesn"t go all the way through.
