Arteries differ from veins in that
A. veins carry blood to the internal organs of the body.
B. arteries have valves that veins do not have.
C. veins have thinner walls than arteries.
D. the pressure in veins is greater than that in arteries.
C. veins have thinner walls than arteries.
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Which of the following acts as a quality control center for cells?
A) Lysosome B) Plasma membrane C) Endoplasmic reticulum D) Nuclear lamina
A nephron____
a. is a kidney tubule b. replaces the blood c. forms feces
d. connects the kidneys to the bladder e. is the functional unit of the kidney
What do these data suggest?
A) increased bird nesting closer to edge habitat B) increased risk of mammalian predation on nests closer to edge habitat C) decreased mammalian visitation closer to edge habitat D) highest level of nest predation by mammals occurring in the interior
Which of the following mechanisms dissipates heat?
a. Countercurrent exchange between vessels that service the extremities b. Trapping air by raising fur or feathers c. Vasodilation of surface vessels d. Vasoconstriction of surface vessels e. Countercurrent exchange between vessels that service the extremities and vasoconstriction of surface vessels