Production of calcitriol is a major effect of:
a. cortisol
b. calcitonin
c. PTH
d. aldosterone
e. TSH
Ans: c. PTH
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Where is the saccule located?
A. In the auditory tube B. Lateral to the auditory ossicles C. Within the vestibule D. Within the cochlea E. Within the middle ear
Sarah is a sprinter who specializes in quick and powerful bursts of speed followed by periods of rest. Priya is a marathon runner who specializes in long, steady runs. Compared to Sarah's muscles, how are Priya's most likely to differ?
A. Priya's type 2X fibers will be larger in diameter. B. Priya muscles will have more glycogen stored in her type 2X muscle fibers. C. Priya's muscles will have more mitochondria in her type 1 and 2A muscle fibers. D. Priya's muscles will have less myoglobin in her type 1 muscle fibers. E. Priya will have a greater proportion of type 2 muscle fibers and a lower proportion of type 1 fibers than Sarah.
Which statement about blood is true?
A) Oxygen is transported by the leukocyte. B) Leukocytes are the most common cell in blood. C) The neutrophil is the rarest type of white blood cell. D) Red bone marrow produces erythrocytes, leukocytes, and thrombocytes.
The diagram illustrates sensory receptors in the skin. What structure does "D" represent?
A. Pacinian corpuscle B. Merkel disks C. Free nerve endings D. Meissner corpuscles E. Ruffini end organ