Biology Unit 1 Practse Paper

Unit 1 Answers to examination-style questions Answers 1 (a) (i) uild up of fatty deposits/atheroma/ b arterial sclerosis/plaque deposits/rakehell clots; in walls of arteries; attach Examiners tips 2 You only need to place one guidance in which high gear concentrations of cholesterin lead to disease of the arteries. It is strategic that you refer to the trim come out of oxygen to the cardiac vigor. This leads to stopping point of the cardiac muscularity cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen impart/is starved of oxygen; vigor dies/muscle does not resolve; 2 (b) ewer people with very high cholesterin f levels; therefore contribution to total/ relational scrap of deaths lower; This is really a feature of the way the data has been provided, i.e. number of deaths in a population. 2 (a) left battlefield ventricle; (b) (i) left) ventricle/heart relaxe s/diastole/ ( filling/not signal detection; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to paint a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the blurb mark point.

3 (a) ffective pee/sewage treatment/proscribe e urine contamination/improve hygiene/ vaccination/quarantining of affected heavens; (b) ral rehydration therapy/ORT or oral o rehydration issue/ORS; replaces lost torso of water supply and salts; OR drinking large amounts of water; with salts/minerals; (c) receptor/protein s on membrane; complementary shape of exotox! in; (d) (i) brisk transport; victimisation ATP/carrier proteins; (ii) igher solute concentration/water h strength lowered in small bowel; osmotic spill of water; 1 Any ii of these ideas for one mark. 2 Many students acknowledgement the sugar use in ORT/ORS. This provides a source of respiratory substrate. The water helps rehydrate the body and the salts replace those that have been lost....If you want to get a just essay, order it on our website: OrderCustomPaper.com

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