The macula densa is part of which of the following structures in the kidney?
A. extraglomerular matrix
B. vasa recta
C. afferent arteriole
D. juxtamedullary nephron
E. juxtaglomerular apparatus
ANS: E
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Smooth muscles that act like skeletal muscles but are controlled by autonomic nerves and hormones are ________.
A) single-unit muscles B) multiunit muscles C) red muscles D) white muscles
If a stimulus created a membrane potential of -40 mV during the absolute refractory period, which of the following would occur?
A. A second action potential begins B. A seres of action potentials occur C. The action potentials end normally D. Sodium inactivation gates open
Continuous ambulatory peritoneal dialysis (CAPD) utilizes the pericardium as a dialysis membrane.
Answer the following statement true (T) or false (F)
Which of the following describes tidal volume?
A. The amount of air moved in a normal breath (inspired or expired) at rest B. The amount of air that can be forcefully expired beyond the amount expired in a normal breath at rest C. The amount of air that can be forcefully inspired beyond the amount inspired in a normal breath at rest D. The amount of air in the lungs that cannot be moved