Which of the following statements regarding leukocytes is TRUE?
A. Leukocytes are only fragments of cells.
B. Leukocytes play a role in oxygen transport.
C. Leukocytes have no nucleus.
D. There is only one kind of leukocyte.
E. Leukocytes are the largest of the formed elements.
Answer: E
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During the cardiac cycle of an individual at rest
A. the volume of blood leaving the left side of the heart is greater than that leaving the right side. B. the duration of systole is greater than that of diastole. C. the pressure of blood leaving the right ventricle is greater than that leaving the left ventricle. D. the duration of diastole is greater than that of systole. E. the contraction of the atria overlaps in time with the ventricular systole.
The spiral organ is housed within which of the following structures?
A. Vestibule B. Scala vestibuli C. Cochlear duct D. Scala tympani E. Anterior semicircular duct
Which best describes a role of L-type Ca2+ channels in cardiac muscle cells?
A. They function exactly the same in cardiac muscle cells as they do in skeletal muscle. B. They are directly responsible for making cardiac muscle fatigue-resistant. C. They are responsible for preventing tetanic contractions. D. They cause the absolute refractory period to be very brief. E. They act as non-conducting voltage sensors that mediate excitation-contraction coupling.
Insulin causes a(n) ________ in glycogenesis in the liver and a(n) ________ in lipogenesis in adipose.
A. increase; decrease B. decrease; increase C. increase; increase D. decrease; decrease