Although pregnant women do not typically exhibit hyperthyroidism, maternal total T4 levels increase during pregnancy. This benign increase in total T4 is due to:
A. increased synthesis of thyroid hormone–binding globulin (TBG)
B. increased pituitary deiodinase activity
C. decreased placental deiodinase activity
D. resistance to thyroid hormone receptor signaling
E. decreased excretion of thyroid hormone by kidney
ANS: A
You might also like to view...
Ethnic differences in skin color are primarily caused by differences in ________.
A. UV radiation exposure B. the quantity of melanin produced C. the quantity of hemoglobin carried in the blood D. the number of melanocytes E. the number of keratinocytes
When a nurse draws blood, it is not uncommon for the needle to penetrate which muscle near the cubital region?
A. Pronator teres B. Supinator C. Semimembranosus D. Buccinator E. Pronator quadratus
Which of the following will cause a decrease in the surface area of the respiratory membrane?
A. emphysema B. tuberculosis C. pneumonia D. All of the choices will reduce surface area of the respiratory membrane
Which of the following statements correctly describes the relationship between DNA, RNA, and transcription factors?
A) There is only one transcription factor for each region of DNA encoding RNA. B) Transcription factors must always bind close to the transcription start site. C) Phosphorylation is one way of regulating interactions between proteins required for transcription of DNA. D) Transcription factors carry out the process of transcription themselves.