The Henry Classification System’s primary classification is arranged around numerical values assigned to ____________ patterns.
A. whorl
B. loop
C. twig
D. square
Answer: A. whorl
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Which of these does NOT provide a physical or chemical barrier?
a) Macrophages b) Saliva c) Urine d) Mucus e) Stratified squamous epithelium
Which nephron structure is especially important in the kidney's ability to produce urine of varying concentration?
a. Bowman' capsule b. proximal tubule c. distal tubule d. loop of Henle e. glomerulus
Atrial depolarization causes the ________.
A. QRS complex B. T wave C. P wave D. first heart sound E. quiescent period
Which is most directly responsible for the falling (repolarizing) phase of the action potential?
A. Voltage-gated Na+ channels are opened. B. The Na+, K+ pump restores the ions to their original locations inside and outside of the cell. C. The permeability to Na+ increases greatly. D. ATPase destroys the energy supply that was maintaining the action potential at its peak. E. The permeability to K+ increases greatly while that to Na+ decreases.