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the enteric nervous system regulates much of the digestive activity but its action depends on the CNS
Chylomicrons are secreted from the basal surface of the absorptive cells and taken into the lacteal in the villus
the absorpitive state is regulated by insulin, whereas the postabsorptive state is regulated by multiple hormones?
aerobic respiration is more efficient than anaerobic fermentation, but the latter is oxygen independent
the most abundant nitrogenous waste in blood is urea, which is produced by the combination of ammonia with carbon dioxide
when a person is active, most of the body heat is generated in the brain, heart, and endocrine glands
In the female fetus, the absence of testosterone results int he development of the external genitalia into clitoris, labia minora, and labia majora
The ovarian cycle typically lasts about 28 days, with day 1 considered to be the first day after ovulation
Human chorionic gonadotropin (HCG) stimulates the corpus luteum to grow and secrete estrogen and progesterone
Prolactin is secreted during pregnancy to stimulate milk synthesis so that milk will be available by the time the infant is born
The mechanism that keeps the testes cooler than the body's core temperature is called descent of the testes
Testosterone stimulates development of the secondary sex characteristics, spermatogenesis, and libido
at early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate enlargement of the testes
Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries allowing blood to engorge the penis
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