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/ tune clots; in walls of arteries; attach Examiners tips 2 You only need to tell 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 muscular tissue cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen affix/is starved of oxygen; go through dies/muscle does not keep down; 2 (b) ewer people with very high cholesterol f levels; therefore contribution to total/ relational sum up of deaths lower; This is really a feature of the way the selective information has been provided, i.e. number of deaths in a population. 2 (a) left empyrean ventricle; (b) (i) left) ve ntricle/heart relaxes/diastole/ ( filling/not catching; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to winder a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the indorsement mark point.

3 (a) ffective pee/sewage treatment/ counteract e urine contamination/improve hygiene/ inoculation/quarantining of affected heavens; (b) ral rehydration therapy/ORT or oral o rehydration solution/ORS; replaces lost carcass of pee and salts; OR drinking large amounts of water; with salts/minerals; (c) receptor/proteins on membrane; complementary! shape of exotoxin; (d) (i) energetic 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 utilise 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 secure essay, order it on our website: OrderCustomPaper.com

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