62. J neutrophil/phagocyte; name A polymorph/granulocyte/eosinophil R monocyte/macrophage/basophile phagocytosis/engulfing/AW; function K lymphocyte/agranulocyte; name A any named lymphocyte, plus correct role produce/release, antibodies; function error carried forward if white cells wrongly named, credit function related to given cell if no names given – credit correct functions for J/K 4 erythrocyte 0 if given, score [4] 1 haemoglobin/haem, carries oxygen/AW; 63. 2 detail of no. of oxygen molecules carried; 3 small size/large SA:V ratio, so haemoglobin never far from cell surface/AW; 4 flexible/elastic/stretchy/changes shape/AW; 5 small size/‘stretchiness’/AW, allows red cells to, fit/squeeze, into capillaries; 6 biconcave/AW [A gives, increased/AW, surface area ‘dimpled’], relative to volume (for diffusion); 7 no nucleus to maximise room for, haemoglobin/oxygen/AW; 8 contain carbonic anhydrase; 9 describe, the reaction catalysed by carbonic anhydrase/role in maintenance of diffusion gradient/AW; 10 transport of carbon dioxide as carbamino-haemoglobin/CO2 combines with Hb; 11 ref buffering effect; 12 AVP; e.g. further detail of oxygen carriage variable oxidation state of Fe small size allows them to be close to tissue or cells idea that lack of, other/named, named organelles, also increases room for Hb/O2 max 6 QWC legible text with accurate spelling, punctuation and grammar; 1 – [7] 64. (i) potometer; R 1 ‘transpirometer’
62. J name neutrophil/phagocyte; A polymorph/granulocyte/eosinophil R monocyte/macrophage/basophile function phagocytosis/engulfing/AW; K name lymphocyte/agranulocyte; A any named lymphocyte, plus correct role function produce/release, antibodies; error carried forward if white cells wrongly named, credit function related to given cell if no names given – credit correct functions for J/K if erythrocyte given, score 0 4 [4] 63. 1 haemoglobin/haem, carries oxygen/AW; 2 detail of no. of oxygen molecules carried; 3 small size/large SA:V ratio, so haemoglobin never far from cell surface/AW; 4 flexible/elastic/stretchy/changes shape/AW; 5 small size/‘stretchiness’/AW, allows red cells to, fit/squeeze, into capillaries; 6 biconcave/AW [A ‘dimpled’], gives, increased/AW, surface area relative to volume (for diffusion); 7 no nucleus to maximise room for, haemoglobin/oxygen/AW; 8 contain carbonic anhydrase; 9 describe, the reaction catalysed by carbonic anhydrase/role in maintenance of diffusion gradient/AW; 10 transport of carbon dioxide as carbamino-haemoglobin/CO2 combines with Hb; 11 ref buffering effect; 12 AVP; e.g. further detail of oxygen carriage variable oxidation state of Fe idea that small size allows them to be close to tissue or cells lack of, other/named, named organelles, also increases room for Hb/O2 max 6 QWC – legible text with accurate spelling, punctuation and grammar; 1 [7] 64. (i) potometer; R ‘transpirometer’ 1
unit-1-answers.docx