The implanting blastocyst "rescues" the corpus luteum by secreting:
A. large quantities of FSH and LH.
B. GnRH, which stimulates the pituitary gland to secrete FSH and LH.
C. human chorionic gonadotropin (hCG)
D. progesterone and estrogen.
E. cortisol.
C
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During breastfeeding, as the baby suckles, nerve signals are relayed from the mother's nipple to the mother's brain. The brain initiates the mother's pituitary gland to produce more prolactin (a hormone), which causes more milk to be ejected. This process of breastfeeding is an example of
A. positive feedback. B. feedforward regulation. C. negative feedback. D. acclimatization. E. adaptation.
Which of the following represents the correct pathway for sperm during ejaculation?
A. Ductus deferens - ejaculatory ducts - rete testes - efferent ductules - epididymis - seminiferous tubules - prostatic urethra - penile urethra - outside the body B. Rete testes - efferent ductules - epididymis - seminiferous tubules - ductus deferens - ejaculatory ducts - prostatic urethra - penile urethra - outside the body C. Seminiferous tubules - ductus deferens - ejaculatory ducts - rete testes - efferent ductules - epididymis - prostatic urethra - penile urethra - outside the body D. Seminiferous tubules - rete testes - efferent ductules - epididymis - ductus deferens - ejaculatory ducts - prostatic urethra - penile urethra - outside the body
In order to retain heat, what occurs in the skin on a cold day?
A. Blood vessels of the epidermis dilate. B. Blood vessels of the dermis constrict. C. Blood vessels of the dermis dilate. D. Blood vessels of the epidermis constrict.
The concentration of a solution expresses the amount of
A) solvent per volume of solute. B) solute per volume of solvent. C) solute per volume of solution. D) solvent per volume of solution. E) None of the answers are correct.