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Mark Scheme

Unit Code

Page 2 of 7

2803/01

Session

Year

January

2001

Abbreviations, annotations and conventions used in the Mark Scheme

/ ; NOT )

ecf AW ora

= alternative and acceptable answers for the same marking point = separates marking points = answers which are not worthy of credit = words which are not essential to gain credit = underlining) key words which must be used to gain credit = error carried forward = alternative wording = or reverse argument

Question 2 (a)(i)

Expected Answers

A = artery, B = vein;

(ii)

X = tunica externa / outer coat / tunica adventitia; Y = tunica media / middle coat; Z = endothelium / tunica interna / tunica intima;

(iii)

X: Y: Z:

collagen / elastic fibres / connective tissue; (smooth) muscle and elastic fibres; (A) collagen if part of list single cell layer / smooth surface / very thin; (A) elastin

(b)(i)

pulsatile / AW; declining (slightly); amplitude declines (slightly) / AW; ref to correct figures;

(ii)

reflects pumping of heart; ref to elastic recoil effect; detail; decrease / amplitude changes, reflect distance from the heart; AVP; e.g. ref to systole / diastole

(iii)

slows rate; allows exchange (in capillaries); reduce likelihood of damage (arterioles / capillaries); not as elastic (as arteries);

Mark Scheme

Version Final

Marks

1

3

3

2 max

2 max

1 max

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