"OUCH!! My muscles are really sore! I've been exercising at such a frantic rate that . . ."
A. my muscle cells have shifted into anaerobic metabolism and I'm making lactic acid that causes them to ache.
B. I'm producing lactic acid that, once I slow down, will make its way back to my liver where it will be converted back into glucose.
C. I need to get more O2 to my muscle cells.
D. All of these choices are true.
D. All of these choices are true.
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Human activities have disrupted the carbon cycle by
A) burning carbon stored as fossil fuels or biomass, thus increasing the amount of carbon dioxide in the atmosphere. B) decreasing the primary productivity of the oceans, resulting in increased atmospheric carbon dioxide. C) burning methane hydrates to produce electricity. D) acidifying the ocean, resulting in the release of large amounts of dissolved carbon dioxide into the atmosphere.
The concentration of CO2 in the atmosphere is lower than its concentration in the oceans
Indicate whether the statement is true or false
Which vertebrate body system is most closely associated functionally with respiration?
a. urinary b. digestive c. endocrine d. circulatory e. integumentary
This group is one of the two main angiosperm clades. This plant group has about 60 000 species that are characterized by having a single cotyledon. What is the name of this plant group?
a. eudicots b. orchids c. monocots d. water lilies