1) These vessels always carry blood away from the heart a) arteries b) capillaries c) veins d) lymph 2) Compared with a vein, an artery has a a) wider lumen b) thinner endothelium c) thicker layer of muscle and elastic fibres d) valves 3) Vasoconstriction would take place to ___________ blood flow to the ___________ during exercise a) increase, muscles b) increase, gut c) decrease, muscles d) decrease, gut 4) Tissue fluid is formed as a result of a) Systole b) Pressure Filtration c) Osmosis 5) Tissue fluid has a similar constitution to Blood plasma except it has no a) Glucose b) Amino Acids c) Plasma Proteins d) Urea 6) The majority of tissue fluid is returned to the blood by a) Diffusion b) Osmosis c) Lymph vessels d) Pressure Filtration 7) In this diagram the elastic fibres are found in layer a) 1 b) 2 c) 3

2.5 Structure of Arteries, Capillaries and Veins

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