Thinker Stinker #3 An \"energetie\" student brought an organism to class for res

Question

Thinker Stinker #3 An "energetie" student brought an organism to class for research purposes. Extensi studies revealed the following about the organism: The red blood cells, which did not contain a nucleus, were always found circulating in blood vessels. The organism contained a four chambered heart and a pair of lungs. The organism took food into one opening and waste products were passed out of an anus. 25. The organism's digestive system functioned to break large food molecules down into smaller molecules so they could be used for: A. photolysis B. CO, fixation C. cell respiration D. None of the choices are correct 26. The organism we studied also contained a thyroid gland. What is the relationship, if any, between the above answer to question number 25, and the thyroid gland? A. there is no relationship B. the hormone produced by the thyroid gland slows the reaction C. the hormone produced by the thyroid gland speeds up the reaction 27. What type of circulatory system did the organism possess? A. incomplete circulatory system B. open circulatory system C. closed circulatory system D. a circulatory system like that of a crayfish Through which type of blood vessel would the exchange of materials with the cells occur? A. arteries 28. B. veins C. capillaries D. all of the above

Explanation / Answer

25- none of the above. This process is called digestion.

26- There is no relationship. The thyroid gland does not secret digestive enzymes.

27- a closed circulatory system.

28- capillaries. These are the fine walled vessels from which material exchange occur.

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