Most of the secreted T4 is
a. phagocytized by target tissues
b. converted into T3 after being peripherally stripped of one of its iodine atoms
c. able to function as the biologically active form of thyroid hormone at the cellular level
d. split to form two DIT molecules, which are excreted in the urine
e. able to exert its full biological effect as a result of epinephrine's permissive actions
B
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A friend confides that she desires to have children but is having trouble conceiving. Which of the following is true regarding implantation?
A) An estimated 60% of implanted embryos later miscarry due to genetic defects of the embryo. B) Detection of human chorionic gonadotropin (hCG) in blood or urine indicates failure of the blastocyst to implant. C) It is estimated that a minimum of two-thirds of all zygotes formed fail to implant by the end of the first week or spontaneously abort. D) In cases where implantation fails to occur, a nonreceptive uterus becomes receptive once again.
Airflow in and out of the spiracles of the insect tracheal system is regulated by motor output from the cerebral ganglia
Indicate whether the statement is true or false
The ability of the nephrons to adjust their own blood flow and GFR without nervous or hormonal control is called renal ____________________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements best describes relaxin?
A. Relaxin is produced by the testes and stimulates secretion of the reproductive glands. B. Relaxin is produced by the ovaries and increases the flexibility of connective tissue. C. Relaxin is produced by the adrenal cortex and maintains normal metabolism. D. Relaxin is produced by the parathyroid glands and triggers the release of calcium from the bones.