Frog disection
Frog disectionFROG’S DIGESTION SYSTEM
Frogs have a mouth, which serves as an insect trap. The mouth, consist of a tongue and two sets of special teeth. The frog has a large elastic gullet that allows it to swallow large prey. Food passes from the gullet through the tubular esophagus and then into the stomach. Then chemical digestion occurs in the stomach and the small intestine with the help of the digestive enzymes that are released by the liver and pancreas.
(Giffard, R. & Nat, M 1986.)
After digestion is completed nutrients are absorbed into the blood through the walls of the small intestines. The waste left over is moved into the large intestine where water is reabsorbed. Then the waste is eliminated through the cloaca and the anus. (Cooper, H, Hays, S, Walker.D, Linden R 1982)
The frog has three lobed livers. The functions of the liver, is to release digestive enzymes to help the stomach and the small intestine with mechanical digestion. The gall bladder stores bile, which breaks down the partially digested foods that, enters the small intestine. Bile has no enzymes but still manages to break down fat into tiny droplets that are ready for faster chemical breakdown. The frog’s stomach is not as complex as a herbivore’s because they have to break down cellulose, which takes a longer time. (Giffard R. & Nat, M 1986)
This concludes my study on the digestion system of the frog.
FROG'S CIRCULATORY SYSTEM
A frog has a closed circulatory system just like humans. This means blood is always enclosed in blood vessels as it circulates the organisms body. Blood also circulates more rapidly and efficiently through a closed circulatory system. It consists of a very well developed system of arteries, veins and capillaries that reach all the living cells of an organism. (Cooper, H., Hays, S., Walker D., Linden R. 1982)
The frog’s heart consists of three chambers. The left atrium receives "oxygenated" oxygen rich blood from the lungs, while the right atrium receives "deoxygenated" oxygen poor blood, which returns from the body tissues. As the two atria pump, together blood from each atrium, it forces into a muscular ventricle. When the ventricle contracts, it forces blood through a major artery called the truncus arteriosus This is a vessel that divides into a number of smaller arteries which supply blood to all parts of the body.
The actual exchange of gases, nutrients, and waste takes place in the capillaries. Once the exchange of material has taken place, the blood flows back through...
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