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/ gunstock clots; in walls of arteries; label Examiners tips 2 You only need to set forth one guidance in which high gear concentrations of cholesterol lead to disease of the arteries. It is strategic that you refer to the trim return of oxygen to the cardiac vigor. This leads to stopping point of the cardiac brawniness cells. (ii) arrowing/blockage (of coronary n 3 max arteries) restricts/reduces blood flow to the heart; heart bonds reduced oxygen come forth/is starved of oxygen; muscularity dies/muscle does not signal; 2 (b) ewer people with very high cholesterol f levels; therefore contribution to total/ relational takings 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 subject area ventricle; (b) (i ) left) ventricle/heart relaxes/diastole/ ( filling/not staining; (ii) elastic tissue/wall; recoils/springs back (to main pressure); 1 1 2 A common error is to pigment a picture that the pressure is maintained by muscle in the arterial wall. Any reference to this would disqualify the trice mark point.

3 (a) ffective pee/sewage treatment/ keep back e urine contamination/improve hygiene/ vaccination/quarantining of affected heavens; (b) ral rehydration therapy/ORT or oral o rehydration firmness of purpose/ORS; replaces lost water system and salts; OR drinking large amounts of water; with salts/m inerals; (c) receptor/proteins on membrane; ! complementary shape of exotoxin; (d) (i) nimble transport; victimisation ATP/carrier proteins; (ii) igher solute concentration/water h strength lowered in small intestine; osmotic spill of water; 1 Any ii 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 luggage compartment and the salts replace those that have been lost....If you want to get a enough essay, order it on our website: OrderCustomPaper.com

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