K.C.S.E Biology Q & A - MODEL 2018PP1QN09
The diagram below represents an organ in a bony fish
(a) Name the organ.
(b) Describe how air in water reach the capillaries inside structure L.
b) Fish mouth opens lowering pressure in buccal cavity and water rushes in; mouth closes increasing pressure that forces
water into the gill cavity/opercular cavity; O2 rich water flows over the gills in a counter current direction to capillary blood
flow; causing O2 to diffuse into the gill capillaries;