Peripheral resistance is
A. inversely related to vessel length and directly related to vessel radius.
B. directly related to vessel length and inversely related to vessel radius.
C. inversely related to both vessel length and radius.
D. directly related to both vessel length and radius.
Answer: B
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Some women prolong breastfeeding or lactation in general as a form of birth control. How would extension of lactation be effective in preventing pregnancy?
A. Lactation stimulates production of placental lactinogen, which is a pregnancy hormone and prevents the corpus luteum from degrading and advancing the reproductive cycle. B. The physical stimulation of breastfeeding causes high levels of progesterone to be produced, which cause secretions in the reproductive tract that are hostile to sperm. C. Prolactin is the hormone that corresponds with lactation. It also inhibits ovulation at the pituitary gland level, so as long as lactation is actively occurring, ovulation is prevented. D. Breastfeeding stimulates production of oxytocin, which causes the endometrium to slough off and exit the body in a menstrual period, preventing implantation of a zygote.
If excess water enters the body,
A) more water is reabsorbed from the renal tubules. B) the collecting duct becomes more permeable to water. C) osmoreceptors in the brain swell. D) ADH release increases.
Water molecules form ________ ions when they associate with a hydrogen ion.
A. hydronium B. bicarbonate C. hydroxide D. water
The thyroid gland secretes all of the following EXCEPT ________.
A. parathyroid hormone B. triiodothyronine C. calcitonin D. thyroxin