K.C.S.E Biology Q & A - MODEL 2019PP1QN08

K.C.S.E Biology Q & A - MODEL 2019PP1QN08

State the role of each of the following in the mammalian respiratory system:
(a) mucus 
(b) cartilage rings 
(c) epiglottis 

answers

.(a) trap foreign particles (from the inhaled /entering air); moisten the (inhaled/incoming) air (for efficient gaseous exchange);
(b) keep the wind pipe /trachea open / not to collapse (to allow for continuous flow of air);
(c) acts as a valve / flap between the larynx and the oesophagus to permit air to enter the air way to the lungs and food particles to pass into the gut / oesophagus: acc prevent food particles from entering the trachea /air passage during swallowing;