Question

I)Name the enzyme present in saliva.Why is it important? ii)What is emulsification? iii)Name the substance that is oxidized in the body during respiration. iv)Why are lungs divided into very small sac-like structures?

Answer 1

1)salivary amylase. it breakdowns starch when we chew the food and convert it into maltose.
2)Emulsification is the process of breaking down of fat globules into tiny droplets in the duodenum ..which provide large surface area for the pancreatic action of enzyme lipase ... and convert fat into fatty acids and glycerol.
3)Glucose is oxidized in presence of Oxygen to give water and CO2 and even releases heat.
4)To increase the surface area for gaseous exchange.

Answer 2

I) Salivary Amylase. It initiates the process of carbohydrate digestion by converting starch to maltose and hence is important.
II) Emulsification is breaking down of the day molecules info small droplets to provide a larger surface area for the enzymes to act upon
III) Glucose
C6H12O6+6O2→6CO2+6H2O+∆(energy)
IV) The small sac like structure of the lungs allows for more surface area in the same volume, resulting in better absorption of oxygen