The circulatory system aids in the homeostasis of the skeletal system by
a) delivering calcium
b) delivering phosphate
c) transporting hormones for bone metabolism
d) transporting hormones for production of red blood cells
e) all of the above
Answer: e) all of the above
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Transmembrane movement of a substance against a concentration gradient is called ________.
Fill in the blank(s) with the appropriate word(s).
Clostridium botulinum typically does not produce its toxin under conditions that are
A. anaerobic. B. alkaline. C. neutral. D. acid.
Which factor has the greatest effect on the
amount of incoming light that strikes an area? a. latitude b. temperature c. humidity d. the ozone layer e. wind pattern
Phospholipids contain ____________________ tails that are repelled by water. Fill in the blank(s) with the appropriate word(s)