Page 735 - Atlas of Histology with Functional Correlations

B. Thicker connective tissue in the lamina propria

C. The presence of membrane plaques in the superficial cells

D. Increased numbers of desmosomes and junctional complexes

E. Denser connective tissue surrounding the bladder wall

5. What are some of the unique properties of the transitional epithelium?

A. It forms an osmotic barrier against concentrated urine.

B. It absorbs fluids and electrolytes.

C. It produces mucus to lubricate the interior of the bladder wall.

D. It becomes permeable to water when urine is dilute.

E. It continues to concentrate urine.

ANSWERS

1. Correct Answer: C. Decreased systemic blood pressure and sodium
concentration in filtrate. Renin converts the protein angiotensin I, which is
converted to angiotensin II, a powerful vasoconstrictor that constricts the
blood vessels and increases blood pressure.

2. Correct Answer: D. Vasoconstriction and release of the hormone
aldosterone. This action increases the reabsorption of sodium chloride and
raises the systemic blood pressure and glomerular filtration rate.

3. Correct Answer: A. Collecting tubules and collecting ducts. The cells of
these ducts contain aquaporins that function as water channels in these

cells. The functions of aquaporins are regulated by ADH that results in
increased water absorption from the filtrate.

4. Correct Answer: C. The presence of membrane plaques in the superficial
cells. The plaques are folded in an empty bladder and are internalized in

vesicles. When the bladder is stretched, the apical membranes expand as the
vesicular compartment becomes part of the apical membrane.

5. Correct Answer: A. It forms an osmotic barrier against concentrated urine.
The apical membrane is thicker and the plaques are impermeable to bladder
contents.

ADDITIONAL HISTOLOGIC IMAGES

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