At what point in the figure above is the urine
most concentrated?
a. A
b. B
c. C
d. D
e. none of these
D
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A red blood cell may burst when placed in
which of the following kinds of solutions?
a. hypertonic b. hypotonic c. isotonic d. any of these e. none of these
Chum salmon (Oncorhynchus keta) are born in freshwater environments and then migrate to the sea. Near the end of their lives, they return to the freshwater stream where they were born to spawn
In freshwater, water constantly diffuses into the body and ions are lost from the body. In salt water, body water diffuses out of the body and excess ions are gained from the water. A salmon's gills have special cells to pump salt in or out of the body to maintain homeostasis. In response to the salmon's moves between freshwater and salt water, some cells in the gills are produced and others are destroyed. These changes made in the cells of the gills during the lifetime of an individual salmon are an example of which of the following? A) evolution B) trade-off C) acclimatization D) adaptation
If the aqueous humor circulates but does not drain properly, the likely result will be the development of
A) glaucoma. B) myopia. C) astigmatism. D) hyperopia.
Which of these are the smallest of veins that form when capillaries merge?
A) venules B) veins C) arteries D) arterioles