Bile is an alkaline fluid produced by the liver and stored in the gall bladder.

$(a)$ Name the extensively coiled structure of the alimentary canal.
$(b)$ Compare the length of the small intestine in herbivores and carnivores.

Explain how the human body responds when adrenaline is secreted into the blood.

What is the significance of emulsification of fats?

Draw the diagram of the alimentary canal of a human and label the following parts:
Mouth,Oesophagus,Stomach,Intestine.

$(a)$ How does the exchange of respiratory gases,oxygen and carbon dioxide,take place between tissues and blood in human beings?
$(b)$ Name the respiratory pigment in humans. Where is it found?