Which of the following contributes to an erythrocyte's efficiency in distributing oxygen?
a. presence of mitochondria
b. biconcave shape
c. lobed nuclei
d. granules
e. extraordinarily large size
b
You might also like to view...
The random changes in gene pool from one generation to the next is termed what?
a. gene flow b. genetic drift c. mutations d. natural selection
What is uremia caused by?
a. High urea levels in the blood b. High creatinine levels in the blood c. Uric acid collecting in the joints d. Low urea levels in the urine
C4 plants have better water conservation abilities than do many other plants (especially C3). This is because:
a) C3 plants are able to keep their stomata closed during the day. b) C4 plants have smaller stomata that are protected by hairs and pits. c) C4 plants open their stomata at night. d) C4 plants have no leaves, they use their stems for photosynthesis. e) C4 plants have the ability to obtain CO2 without opening their stomata.
Much of the coordination of vertebrate body functions via chemical signals is accomplished by the _____
A) respiratory system B) endocrine system C) integumentary system D) excretory system