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(c)

valves; prevent backflow / AW; (action of surrounding) muscle; NOT muscle in wall of vein pushes blood / squeezes veins; large lumen; little resistance; ref to negative pressure in, chest / thorax / heart; ref to gravity effect (from areas above the heart);

(d)(i)

proteins too large to pass out / AW;

(ii)

red blood cells, only in blood / not in tissue fluid; more white blood cells in blood; platelets only in blood; ref to (hydrostatic) pressure differences; ref to dissolved gas levels qualified; blood in vessels / tissue fluid not in vessels; AVP;

4 max

1

3 max

[Total:

20]

Mark Scheme

= 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

Version Final

Unit Code

Session

Year

2803/01

January

2001

Page 3 of 7

Abbreviations, annotations and conventions used in the Mark Scheme

/ ; NOT )

ecf AW ora

Mark Scheme

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