K.C.S.E Biology Q & A - MODEL 2010PP2QN02

K.C.S.E Biology Q & A - MODEL 2010PP2QN02

The diagram below shows blood circulation in a mammalian tissue.

(a) Name the parts labelled P and Q.
 P . 
 Q . 
(b) Name the substances that are:
(i) required for respiration that move out of capillaries; 
(ii) removed from tissue cells as a result of respiration. 
(e) Explain how substances move from blood capillaries into the tissue cells. 
(d) Name one component of the blood that is not found in the part labelled P.

answers

(a)
P  Tissue fluid/intercellular/interstitial fluid/space;
Q  Venule;
(b) (i) Glucose, oxygen; 
(ii) Carbon (iv) Oxide, water; 
(c) Blood entering arteriole has a high pressure; the pressure forces water and small solute molecules in blood to go through capillary wall forming tissue fluids; nutrients/oxygen more into the tissue cells by diffusion; 
(d) Red Blood cells/proteins/platelets;