881. The probable source of surface active material (surfactant) coating the alveolar surface is
A. goblet cells
B. small alveolar cells (type I orA pneumocytes)
C. great alveolar cells (type II or B pneumocytes)
D. Clara cells
E. septal cells

882. The structural/functional unit of the respiratory system is
A. a terminal bronchiole and its branches
B. an alveolus
C. a bronchopulmonary segment
D. an alveolar duct and its branches
E. a respiratory bronchiole and its branches

883. Smooth endoplasmic reticulum would be expected to be most abundant in
A. steroid secreting cells
B. fibroblasts
C. mucous secreting cells
D. serous secreting cells
E. rubriblasts

884. A uriniferous tubule (nephron) includes all of the following except
A. glomerulus
B. Bowman’s capsule
C. juxtaglomerular apparatus
D. basal lamina (basement membrane)
E. podocytes

885. Juxtaglomerular cells are modified
A. distal tubule cells
B. proximal tubule cells
C. efferent arteriole cells
D. macula densa cells
E. afferent arteriole cells

886. The macula densa of the kidney is formed by cells of the
A. afferent arteriole
B. distal convoluted tubule
C. descending thick part of Henle’s loop
D. proximal convoluted tubule
E. thin portion of Henle’s loop

887. The majority of water resorption in the kidney occurs in the
A. connecting tubules
B. Thin loop of Henle
C. distal convoluted tubules
D. proximal convoluted tubules
E. collecting tubules

888. All of the following regarding podocytes is correct except
A. line part of the capsular space
B. produce basal lamina
C. possess pedicles
D. form part of the blood-urinary barrier
E. are joined to one another by tight junctions

889. Pericytes are commonly found in association with
A. sinusoids
B. lymphatic capillaries
C. discontinuous capillaries
D. fenestrated capillaries
E. continuous capillaries

890. Which of the following components of blood vessels is most consistently present?
A. endothelium
B. tunica media
C. tunica adventitia
D. elastic tissue
E. smooth muscle fibers

NOTE
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