Nares
These small slits are called external nares and allow a frog to float on the surface of the water and still inhale oxygen. Frogs have other ways of taking in oxygen as well, as you’ll soon see.EndFragment
Explore the external anatomy of the frog by clicking on various parts of the frog and learning more about each one. EndFragment
Teeth[if gte mso 9]>
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You have completed the dissection!
EndFragment EndFragment EndFragment EndFragment
Please chose a more appropriate tool or option.
On the next page click on an organ to learn about it, then remove it immediately to the organ tray. Begin with the fat bodies to allow you a better view of the organs. Then, explore each organ as you wish. If you prefer to follow instructions rather than explore on your own, click on the help function.
EndFragmentEndFragmentEndFragmentEndFragment
On the next page click on the organ to learn about it, then remove it immidiately to the organ tray. Begin with the fat bodies to allow you a better view of the organs. Then, explore each organ as you wish. If you prefer to follow instructions rather than explore on your own, click on the help function.
Inside the frog’s mouth, you will see the esophagus, a tube where food passes from the mouth to the stomach. Food is moved down the esophagus by a process called peristalsis, which is coordinated muscular contraction of muscles in the esophagus. You’ll also see the glottis, which is the opening to the lungs. The glottis can prevent foreign objects from entering the lungs. (This organ is part of the digestive system).
EndFragment
These small slits are called external nares and allow a frog to float on the surface of the water and still inhale oxygen. Frogs have other ways of taking in oxygen as well, as you’ll soon see.EndFragment
Video: Live
Dissection
Large intestines
The frog's large intestine reabsorbs and recycles the water used in digestion. The large intestine leads to the cloaca for waste to be excreted. EndFragment
The small intestine is an organ at the end of end of the esophagus that stores and digests proteins, minerals, sugars, and vitamins in food into nutrients to be absorbed into the bloodstream. The small intestine is coiled up and is connected with the large intestine, where the final stages of digestion occur. The frog's large intestine reabsorbs and recycles the water used in digestion.
[if !supportAnnotations][endif]EndFragment
Small intestine
The gonads refer to ovaries (in females) and testes (in males). A mature female frog’s ovaries would be highly visible if eggs have been produced. The eggs, once internally fertilized by sperm, are deposited outside the body through the cloaca. EndFragment
Gonads
The bile (the substance that helps to break down fats) is stored in the gall bladder, a small, thin sack located beneath the liver. Here, you can clearly see the pylorus, where the stomach ends and the small intestines begin. (This organ is part of the digestive system.).EndFragment
The heart is a complex organ made out of one of the three classes of muscle: cardiac muscle, smooth muscle, which makes up the tubing, like blood vessels and intestines and skeletal muscle, which controls locomotion. EndFragment
Kidney
Small intestines
Click on an organ to learn about it, then remove it immediately to the organ tray. Begin with the fat bodies to allow you a better view of the organs. Then, explore each organ as you wish. If you prefer to follow instructions rather than explore on your own, click on the help function.
Large intetines
StomachEndFragment
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Large intestine
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The mesentery is a thin membrane that serves to hold organs in place. It also carries fluids between organs. The pancreas, embedded in the mesentery, produces substances that neutralize acid which are then delivered to the stomach from the gall bladder along with bile. The pancreas also releases insulin (helps the body to process sugar) and digestive enzymes.EndFragment
Splin
The spleen makes, stores and destroys blood cells and plays a role in both filtering the blood and helping the immune system. (This organ is connected to the digestive system but is part of the circulatory system.). EndFragment
Instructions: Internal anatomy(Scroll down to read all the instructions. Close the Instructions to begin activity.)Click on an organ to learn about it, then remove it immediately to the organ tray.
[if !supportLists]1. Start with the fat bodies. These “fingery” looking structures are usually underneath the stomach. Then continue to learn about the internal organs of the frog by clicking on the organs, reading the information and remove each organ immediately to the organ tray.[if !supportLists]2. Locate the liver (the large, dark three-lobed organ) and the smaller gall bladder that lies beneath it.[if !supportLists]3. Locate the esophagus.[if !supportLists]4. Locate the stomach - the largest of the digestive organs. It has a half moon shape and is usually found on the left side of the body cavity.[if !supportLists]5. Locate the small and large intestines.[if !supportLists]6. Locate the small pancreas. It is attached to the “curve” of the stomach, usually lying underneath it, and might look like a thin thread, within the mesentery, the membranous tissue that connects the internal organs.[if !supportLists]7. Locate the dark red spleen, also in the tissues of the mesentery.[if !supportLists]8. Locate the two small dark pink lungs, which are on either side of the heart. They may appear spongy or floppy and deflated.
[if !supportLineBreakNewLine]
[endif][if !supportLists]9. [endif]Locate the heart, usually near the top of the liver.
[if !supportLists]10. [endif]If your frog is a mature female, locate the ovaries which contain hundreds of darkly colored eggs. If your frog lacks these large egg bodies, look carefully for two yellow small bean shaped organs. These are the testes, where the sperm is produced in the male.
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Video: Images of Dissection
Video: Images of
Dissection
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