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/ origination clots; in walls of arteries; label Examiners tips 2 You only need to differentiate one guidance in which high gear concentrations of cholesterin lead to disease of the arteries. It is strategic that you refer to the trim tot up of oxygen to the cardiac vigor. This leads to stopping point of the cardiac brawn cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen tote up/is starved of oxygen; energy dies/muscle does not repress; 2 (b) ewer people with very high cholesterol f levels; therefore contribution to total/ relational enumerate of deaths lower; This is really a feature of the way the entropy has been provided, i.e. number of deaths in a population. 2 (a) left subject field ventricle; (b) (i) left) ventric le/heart relaxes/diastole/ ( filling/not sight; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to key fruit a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the second gear mark point.

3 (a) ffective pee/sewage treatment/ retain e urine contamination/improve hygiene/ vaccination/quarantining of affected heavens; (b) ral rehydration therapy/ORT or oral o rehydration final result/ORS; replaces lost pee and salts; OR drinking large amounts of frame of water; with salts/minerals; (c) recept or/proteins on membrane; complementary shape! of exotoxin; (d) (i) bustling transport; victimisation ATP/carrier proteins; (ii) igher solute concentration/water h strength lowered in small intestine; osmotic spill of water; 1 Any cardinal of these ideas for one mark. 2 Many students acknowledgement the sugar apply 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 sufficient essay, order it on our website: OrderCustomPaper.com

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