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Amphibians are unique in their ability to live both on the land and in water and metamorphose during their life cycle. Frogs lay eggs, usually in a string or a mass that sticks to vegetation and are fertilised by the male as they are laid. The eggs hatch into the first larval stage which lasts for 2-25 days depending on the temperature or species of frog. Life as a tadpole is spent in the water and during this life stage they have gills rather than lungs and don’t possess legs. As a tadpole, frogs grow longer and form fins, develop hind then front legs, their tail becomes shorter and their gills are replaced by lungs.
Mouth
Mouth
1. Vomarine teeth
Digestive System
Digestive System
- Vomerine teeth
A set of small teeth located on vomer bone in roof of mouth of not only frogs but various other.
These teeth are found in various species of fish, amphibians, reptiles, and mammals.
- Liver
Frog's liver is almost as large as its body size and is located in its abdominal cavity's upper part.
It has a reddish-brown color and a smooth texture.
It's made of several lobes, each contains thousands of tiny cells called hepatocytes.
- Small Intestine
The small intestine of a frog is a vital organ responsible for the digestion and absorption of nutrients from food. It is a long, coiled tube that connects the stomach to the large intestine. The small intestine is divided into three parts: the duodenum, jejunum, and ileum.
The duodenum is first part of small intestine and responsible for receiving partially digested food from stomach. Here, digestive enzymes from the pancreas and bile from the liver are added to further break down food particles. The duodenum also plays a role in regulating the release of digestive juices from other organs.
The jejunum is the middle section of the small intestine and is where most nutrient absorption takes place. The walls of the jejunum are lined with tiny finger-like projections called villi, which increase the surface area available for nutrient absorption. Nutrients such as carbohydrates, proteins, and fats are broken down into smaller molecules and absorbed into the bloodstream through these villi.
The ileum is the final section of the small intestine and is responsible for absorbing any remaining nutrients and water before passing waste material into the large intestine.
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