The descending limb of the nephron loop ________
A) is not permeable to water
B) is freely permeable to sodium and urea
C) contains fluid that becomes more concentrated as it moves down into the medulla
D) pulls water by osmosis into the lumen of the tubule
C
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__________ cells in the respiratory mucosa secrete mucus.
Fill in the blank(s) with the appropriate word(s).
At high altitudes, the alveolar
a. is higher than normal b. is lower than normal c. is higher than normal d. and are higher than normal e. is lower than normal and is higher than normal
Cardiac muscle can be distinguished from skeletal muscle because cardiac muscle:
a. Forms muscle fibers with larger diameters than those of skeletal muscle b. Has 15 to 20 nuclei per muscle fiber (cell) c. Lacks intercalated disks d. Lacks striations e. Possesses a nucleus located in the center of each muscle fiber
At gap junctions, the intercellular space:
A. widens and is filled by electron-lucent material B. widens and is filled by electron-dense material C. narrows and is filled by electron-lucent material D. narrows and is filled by electron-dense material