BIOL273 Lecture Notes - Lecture 4: Chordae Tendineae, Heart Valve, Pulmonary Vein
28 Apr 2020
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Document Summary
Role of the cardiovascular system: multicellular organisms. Only the surface layer is in contact with the environment: we require nutrients and oxygen from it, rate of diffusion to these is limited by distance. Overcome this diffusion limitation by: cardiovascular system for transport of substances through the body, transported by flow of blood through circulatory system, bulk flow rather than diffusion, materials transported. From the external environment to tissues nutrients, water, gases (especially o2) Between tissues of body wastes, nutrients, hormones. From tissues to external environment metabolic wastes, gases (especially co2), heat: components (fig 16. 3) Pericardium a tough membranous sac surrounding the heart. [base-major attach b. v. : made of two layers with a small amount of fluid between them for lubrication. Coronary arteries: nourish the heart muscle, heart has a very high o2 muscle absolutely depends on adequate blood flow, lack of blood supply to heart leads to a heart attack (myocardial infraction, internal anatomy.
