K.C.S.E Biology Q & A - MODEL 2007PP2QN01

K.C.S.E Biology Q & A - MODEL 2007PP2QN01

The diagram below represents some gaseous exchange structures in humans

​(a) Name the structures labeled K, L, and M 
K…………………………………………………………………………….
L…………………………………………………………………………….
M……………………………………………………………………………
(b) How is the structure labeled J suited to its function? 
(c) Name the process by which inhaled air moves from the structure labeled L into blood capillaries 

ANSWERS

​( a) K- Pleural membranes
L- Alveolus
 M- Intercostal muscles
(b) Has c- shaped cartilage rings that support it preventing it from collapsing and  allow free flow of air
Inner lining has secreting cells that trap fine dust particles and micro- organisms 
Inner lining has hair like structures called cilia that enhance upward movement of the mucus to the larynx
(c) Diffusion