Question

6 Describe an activity to show that exhaled air contains carbon dioxide
7. Describe the changes that take place (i) around the rib cage (ii) diaphragm
(ii) chest cavity during inspiration State the effect of these changes​

Answer 1

Answer:

6)Take a test tube fill it with freshly prepared lime water take a straw dip it inside lime water and then exhale you will find that the lime water turns it's colour to white like milky colour.This shows that the air we exhale is carbon dioxide.

7) 1.During inspiration,the diaphragm and externalcostal muscles contact causing the ribcage to expand and move outward,and expanding the thoracic cavity and lung volume.This creates a lower pressure within the lung than that of the atmosphere,causing air to be drawn into the lungs.