overall importance of system:
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- breaks down food
- contains 4 major organs: esophagus, stomach, large intestine and small intestine
- acid and enzymes to break down food
- in all animals
- gets rid of waste
- important to survival
- mechanicle digestion
- chemicle digestion
- part of circulatory system
evolutionary advantage/disadvantage:
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Evolution has taken all 4 of these organisms and gave them traits to survive and improved the ones that they all have in common. In the simple organism such as the earthworm the digestive system is made up of on 4 small organs, they don't have a stomach instead they have something called the gull bladder (organ in which it breaks down dirt with rocks and powerful enzymes) which acts as its main digestive organ to transfer out the nutrients and food it will need to survive. In the more complex animal such as the white rat, its digestive system is a lot like humans. Both the frog and rat both have the advantage of having a digestive system that carefully selects through tubes of intestines ans stomach acids and enzymes the needed vitamins and proteins wanted for those animals to survive. Disadvantages to having such a simple digestive system is the limitations to what the organism can feed on to stay alive, as for the complex disadvantages the organs are always at risk of health issues, abrupt eruptions in the lining of the stomach causing the very strong acids to empty out into the body cavities.
similarities and differences between organisms
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EARTHWORM:
CRAYFISH:
GRASS FROG:
WHITE RAT:
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Evolution has taken all 4 of these organisms and gave them traits to survive and improved the ones that they all have in common. In the simple organism such as the earthworm the digestive system is made up of on 4 small organs, they don't have a stomach instead they have something called the gull bladder (organ in which it breaks down dirt with rocks and powerful enzymes) which acts as its main digestive organ to transfer out the nutrients and food it will need to survive. In the more complex animal such as the white rat, its digestive system is a lot like humans. Both the frog and rat both have the advantage of having a digestive system that carefully selects through tubes of intestines ans stomach acids and enzymes the needed vitamins and proteins wanted for those animals to survive. Disadvantages to having such a simple digestive system is the limitations to what the organism can feed on to stay alive, as for the complex disadvantages the organs are always at risk of health issues, abrupt eruptions in the lining of the stomach causing the very strong acids to empty out into the body cavities. similarities and differences between organisms
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EARTHWORM:- long intestine
- gull bladder
- simple
- filled with water
- waste is food
- digests dirt
- body contractions create mechanical digestion
- no veins
CRAYFISH:
- pyloric stomach
- intestine gland in tail
- cardiac stomach
- no veins
- mechanical digestion
GRASS FROG:
- contains the 4 organs to digestion
- chemicle digestion
- similar to humans
- gull bladder
WHITE RAT:
- 4 organs
- similar to humans
- chemicle digestion
- acids enzymes break down most things
Make sure you talk about which organic compounds we need (you can mention it up at the top), and you need to elaborate about the difference between mechanical and chemical digestion.
ReplyDeleteWith the earthworm, its not a gall bladder, are you talking about the crop or the gizzard?
What are the advantages of having a simple digestive system? You talk about the disadvantages, not the advantages.
What about the digestive gland for the crayfish?
You need to get more specific about the frog and the rat: what organs are unique, and what are they used for?
Seems like you need a little more research for this section. . .