Biology · Oct / Nov 2024 · Paper 42 · Question 2

X external intercostal muscle ;

Y bronchiole ;

Z diaphragm ;

name: cartilage ;

function: support / prevent collapse of / AW, trachea ;

ciliated (cells) ;

goblet (cells) ;

any five from:

1

pressure (inside the thorax) decreases then increases ; 2

volume (of air inside the thorax decreases then) increases ;

3

ref to inspiration ;

4

diaphragm, contracts / flattens ;

5

external intercostal muscles contract

/ internal intercostal muscles relax ;

6

ribs moved, up / out ;

increases / AW ;

brain ;

depth ;