Blood supply to the proximal and distal convoluted tubules of the nephron is provided by the __________.
afferent arterioles
interlobular veins
peritubular capillaries
segmental veins
peritubular capillaries
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Cells that respond to ligands
A. possess receptor sites for specific ligands. B. are using electrical signals in cellular communication. C. have lysosomes that destroy the ligands. D. generally produce the ligands. E. are not functional.
The most common congenital heart defect is
A) ventricular septal defect. B) patent foramen ovale. C) tetralogy of Fallot. D) atrioventricular septal defect. E) transposition of the great vessels.
The ventricle associated with the pons and upper medulla is the
A) first. B) second. C) third. D) fourth. E) lateral.
Contraction of the papillary muscles would
A. eject blood from the ventricles. B. prevent the AV valves from protruding into the atria. C. close the semilunar valves. D. cause the atria to eject their contents into the ventricles. E. open the semilunar valves.