K.C.S.E Biology Q & A - MODEL 2016PP2QN04

K.C.S.E Biology Q & A - MODEL 2016PP2QN04

The diagram below represents some gaseous exchange structures in humans.

​(a)Name the structures labeled K, L and 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.
(d) Give the scientific name of the organism that causes tuberculosis in humans. 

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 mucus secreting cells that trap fine dust particles and microorganisms
 Inner lining has hair like structures called cilia that enhance upward movement of the mucus to the larynx
(c)  Diffusion
(d)  Mycobacterium tuberculosis (underline separately).