The digestive system of Frog consists of alimentary
canal and associated digestive glands.
Alimentary canal: -
It is a long, coiled tubular structure of
varying diameter extending from mouth to cloaca. It is complete. It consists of
mouth, buccal cavity, pharynx, oesophagus, stomach, small intestine, cloaca and
cloacal aperture.
·
Mouth: - It is anterior opening of alimentary canal
and is a wide gape at the top of snout. It remains bounded by immovable upper jaw
and movable lower jaw. Lower jaw moves up and down to close and open the mouth.