Mesangial cells help keep the basement membrane clean by
A. secreting emulsifying agents that dissolve trapped particles.
B. engulfing macromolecules caught in its basement membrane.
C. secreting antibodies that attack the molecules caught in the endothelium.
D. opening larger pores in the membrane so that trapped particles move across.
Answer: B
You might also like to view...
Adults who are GH deficient tend to have reduced skeletal __________ mass and strength and decreased __________ density
Fill in the blank(s) with correct word
During an annual health examination of a 46-year-old woman, a physician finds hyper- secretion of norepinephrine from her supra- renal medulla. Which of the following types of nerve fibers are most likely overstimulated?
(A) Preganglionic sympathetic fibers (B) Postganglionic sympathetic fibers (C) Somatic motor fibers (D) Postganglionic parasympathetic fibers (E) Preganglionic parasympathetic fibers
C) neural crest.
A) hindbrain. B) midbrain. C) forebrain.
The steps in the process of endochondral ossification area: Ossification center forms in the diaphysis.b: Cartilage calcifies and a bone collar forms.c: Ossification centers form in the epiphyses.d: Bone replaces cartilage.e: Epiphyseal plates ossify.f: Cartilage model develops.The correct chronological order for these steps is
A. b. - c. - f. - a. - e. - d. B. f. - b. - a. - c. - d. - e. C. a. - e. - c. - d. - b. - f. D. f. - b. - c. - d. - a. - e. E. a. - c. - b. - d. - e. - f.