Which of the following is NOT true of sound wave frequency?
A. Sound wave frequency can be reported in waves per second.
B. The units for sound wave frequency are hertz (Hz).
C. Different sound wave frequencies stimulate specific hair cells in certain portions of the spiral organ.
D. Different sound wave frequencies are perceived as different degrees of loudness.
E. All of these are true of sound wave frequency.
Answer: D
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Airway resistance
a. is normally the primary factor determining the amount of flow into/out of the lungs b. decreases when the diameter of the airways becomes reduced c. when elevated, requires an increased pressure gradient between the lungs and atmosphere through vigorous respiratory efforts to move even normal volumes of air into and out of the lungs d. is lower in people with asthma e. decreases when lung compliance increases
Which hormone-secreting cells are found in the adrenal gland?
A) Chromaffin cells B) Follicular cells C) Islet cells D) Chief cells
When an endocrine gland produces too much or too little of its hormone, it is called ________
A) allostasis B) a hormone imbalance C) an upregulation of hormonal distribution D) a flight-or-fight response
An anion is
A. a molecule that conducts electricity when placed in solution. B. a negatively charged ion. C. a combination of atoms held together by chemical bonds. D. an alteration in the three-dimensional structure of a protein. E. a positively charged ion.