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Activity 1.6 Investigating arteries and veins Student A1.06S Questions Q1 How do the results for artery and vein compare when looking at: a % change in length on loading? b return to the original length on unloading? Q2 What are the main properties of: a elastic fibres b collagen?
This activity has two parts. In part A students stretch blood vessels (a piece of artery and a piece of vein) and measure how elastic they are. In part B they look at the histology of the blood vessels using a microscope.
The elastic properties of the arteries are essential for blood flow. The pressure in the arteries increases and arterial walls stretch when the blood is pumped out of the heart. When the aortic valve shuts, the pressure in the arteries drops and the arterial walls relax to maintain the blood flow.
26 Δεκ 2019 · Top, the typical nonlinear relation between luminal pressure and area in large elastic arteries, explained by the progressive shift in load bearing from elastin to collagen fibers. Data translate into distensibility and pulse wave velocity (PWV) with the use of the Bramwell-Hill relation.
Keywords: Arteries; Mechanical properties elasticity 1. Introduction It is well known that the elasticity of materials is expressed in Hooke’s law as follows: Tensile stress of a solid is proportional to the amount of deformation, provided the deformation is not permanent. Hooke’s law applied to an elastic bar of length l can be expressed ...
21-1 Blood Vessels. The Tunica Intima (Inner Layer) Includes: The endothelial lining. Connective tissue layer. Internal elastic membrane. In arteries, is a layer of elastic fibers in outer margin of tunica intima.
Elastic recoil in arteries and veins. Take rings of artery and vein tissue. Load and unload with 10 g masses and hence assess differences in elasticity. Consider how the elastic properties suit the different functions of artery and vein in the circulatory system.
