Implantation of a blastocyst:
A. normally occurs within the oviduct (fallopian tube).
B. normally begins around day 21 of the typical menstrual cycle.
C. occurs within 24 hours of fertilization of the oocyte.
D. takes place at a time in the typical menstrual cycle when estrogen concentration in the blood is higher than progesterone concentration in the blood.
E. requires the presence of high concentrations of follicle-stimulating hormone (FSH).
B
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The special movement of the thumb that allows it to grasp an object and hold onto it is called
A) rotation. B) opposition. C) circumduction. D) eversion. E) retraction.
During the menstrual phase of the uterine cycle,
a. a new ovarian follicular phase is beginning. b. estrogen and progesterone levels reach their lowest concentration. c. vasoconstriction of the uterine vessels occurs in response to release of a uterine prostaglandin. d. the corpus luteum degenerates. e. all of these answers.
During spermatogenesis _______________________
A. the acrosome migrates towards the posterior end of the spermatid because its hydrolytic enzymes will be needed for digestion of the excessive cytoplasm around the flagella of the developing sperm B. the acrosome migrates towards the anterior end of the spermatid because its hydrolytic enzymes will be needed for penetration when the sperm contacts the egg during fertilization C. the acrosome migrates towards the anterior end of the spermatid because its pointy shape helps the sperm move more efficiently D. the acrosome migrates towards the posterior end of the spermatid because of its ability to propel the flagella moving the sperm through the female reproductive system towards the egg
A person with type AB blood can successfully receive blood from a person with type
___________ blood. A) all of the above B) O C) B D) A