What structures regulate blood flow into capillary beds?
A) precapillary sphincters
B) venous valves
C) postcapillary sphincters
D) Peyer's patches
A
You might also like to view...
Animals that lack a vertebral column are known as
A. inarticulates. B. invertebrates. C. supinates. D. retrogrades. E. aspinates.
A particular sea bird has a Type 1 survival curve, and older female birds produce more eggs than younger birds. What is an evolutionary strategy of these birds?
a. young birds reach maturity rapidly b. reproduction is delayed c. birds reach maturity slowly d. both a and b e. both b and c
Sea stars are primarily:a
herbivores. b. omnivores. c. carnivores. d. detritivores. e. saprophytes.
Which of these is the smallest unit upon which natural selection directly acts?
A) a species? gene frequency B) a population?s gene frequency C) an individual?s genome D) an individual?s genotype E) an individual?s phenotype