Circulation in the accompanying diagram functions primarily as a(n) ____
a. an open circulatory system
b. system consisting of mostly of tissue spaces
c. closed circulatory system
d. interstitial fluid system
e. three-directional system
ANSWER: c
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Which of the following parasites is the major parasitic cause of deaths worldwide, yet its transmission could be prevented by access to clean water?
A. Cryptosporidium parvum B. Giardia intestinalis C. Cyclospora cayetanensis D. Entamoeba histolytica
Which numbers identify structures that are found in ALL prokaryotes?
a. 2 and 4 b. 3 and 4 c. 1 and 5 d. 5 and 9 e. 7 and 8
Antibodies are
A. specific molecules, or parts of molecules, that the body recognizes as foreign. B. enzymes secreted to destroy a pathogen's cell wall. C. proteins on the surface of our cells to which pathogens attach. D. cells that protect the body against invaders. E. proteins the body produces against invading substances.
Figure 25.2
Use the illustration above to answer the questions 4 and 5.
In the accompanying figure, which structure is a rod of flexible connective supporting the body?
A. A B. B C. C D. D E. E