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Mark Scheme

Page 6 of 7

Unit Code

Session

Year

2803/01

January

2001

Version Final

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 4 (a)

Expected Answers

0.8 – 0.83 sec / s / second ; 75 ; ecf

Marks

2

(b)

lengthens cycle (by 0.1-0.2 seconds) / fewer beats per min / slows (heart)

rate; ventrical contraction time increased a little; ventrical recovery takes longer;

2 max

small irregular contractions / no pattern / AW;

1

blood will not be pumped / heart attack / death / loss of consciousness; description is most likely to start at atrial systole

1

atria (full of blood) contract / atrial systole; blood into ventricles; atrioventricular valves open; (A) alternative names valves in veins stop blood returning to veins; ventricles contract / ventricular systole; blood forced into, arteries / aorta and pulmonary artery; semi-lunar valves open; atrioventricular valves shut (to stop backflow); ventricles (and atria) relax / diastole; semi-lunar valves close (to stop backflow from arteries); blood enters atria; some passes through to ventricles; effect of pressure in closing valves (semi-lunar or atrioventricular); AVP; AVP; AVPs to include control by SAN, AVN, Purkyne tissue; ref to papillary muscle

8 max

Q – clear, well organised using specialist terms;

1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

(c)(i)

(d)

(ii)

[Total:

9 max 15]

Mark Scheme

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