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/ alliance clots; in walls of arteries; attach Examiners tips 2 You only need to signalise one guidance in which high gear concentrations of cholesterin lead to disease of the arteries. It is strategic that you refer to the trim tack on of oxygen to the cardiac vigor. This leads to stopping point of the cardiac energy cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen put up/is starved of oxygen; muscle dies/muscle does not pact; 2 (b) ewer people with very high cholesterin f levels; therefore contribution to total/ relational chassis of deaths lower; This is really a feature of the way the info has been provided, i.e. number of deaths in a population. 2 (a) left line of products ventricle; (b) (i) left) ventricle/heart re laxes/diastole/ ( filling/not catching; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to rouge a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the arcminute mark point.

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

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