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True and False

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the enteric nervous system regulates much of the digestive activity but its action depends on the CNS
false
odor, sight, and taste stimulate salivatory nuclei in the cerebral cortex
false
Enamel is found in the crown of a tooth, whereas dentin is part of both crown and root.
true
Both chemical and mechanical digestion start in the mouth and continue in the stomach
true
Gastric juice consists entirely of water and hydrochloric acid.
false
Absorption of many nutrients starts in the stomach
false
The liver is the body's largest gland
true
Both pacreatic juice and bile are secreted into the duodenum
true
The small intestine begins with the duodenum, which is the longest segment
false
The brush borders of intestinal absorptive cells contain numerous goblet cells
false
Most fat is digested by pancreatic lipase
true
Chylomicrons are secreted from the basal surface of the absorptive cells and taken into the lacteal in the villus
true
The large intestine absorbs water, fats, and salts
false
The large intestine is longer than the small intestine
false
The digestive system processes food, extracts nutrients, and eliminates the residue
True
Gut brain peptides are secreted by the brain and target the GI tract?
false
glucose in excess of the body's immediate needs is usually converted to protein
false
both glycogenesis and gluconeogenesis are examples of catabolism
false
the absorpitive state is regulated by insulin, whereas the postabsorptive state is regulated by multiple hormones?
true
heat promoting center is located in the hypothalamus, which triggers shivering
true
body weight is stable when average daily energy intake and output are equal
true
NE stimulates cravings for carbs whereas endorphins stimulate cravings for proteins
true
aerobic respiration is more efficient than anaerobic fermentation, but the latter is oxygen independent
true
most body fat in overweight people is stored in the integumentary system
false
consumption of excess calories during adulthood causes adipocytes to multiple
false
the most abundant nitrogenous waste in blood is urea, which is produced by the combination of ammonia with carbon dioxide
true
the absorptive state lasts about 15 minutes after a meal
false
mental state does not affect metabolic rate
false
when a person is active, most of the body heat is generated in the brain, heart, and endocrine glands
false
hypothermia may be fatal if the core body temperature reaches 37 or lower
false
In the female fetus, the absence of testosterone results int he development of the external genitalia into clitoris, labia minora, and labia majora
True
The uterus is a thick muscular chamber inferior to the urinary bladder
False
The vagina has no glands but it is moistened by mucus from glands in the cervical canal
True
Although two breast cancer genes are known, most cases are nonhereditary
True
Inhibin modulates the secretion of LH
False
The number of ovarian follicles declines with age, leading to a reduction of estrogen levels
True
The ovarian cycle typically lasts about 28 days, with day 1 considered to be the first day after ovulation
false
most primary oocytes undergo atresia during climacteric
False
the proliferative phase of the uterus is driven by estrogen from the ovaries
True
In the excitement phase, the uterus rises from its forward-tilted (anteverted) position
True
Unlike men, women lack a refractory period and may experience successive orgasms
True
Human chorionic gonadotropin (HCG) stimulates the corpus luteum to grow and secrete estrogen and progesterone
True
Progesterone stimulates uterine contractions
False
Prolactin is secreted during pregnancy to stimulate milk synthesis so that milk will be available by the time the infant is born
True
Oxytocin stimulates contraction of myoepithelial cell of the mammary acini
True
Sexual Reproduction entails the union of two gonads to form a zygote
False
The presence of the Y chromosome guarantees the development of male secondary sex organs
True
The mechanism that keeps the testes cooler than the body's core temperature is called descent of the testes
False
The scrotum contains the testes and spermatic cords
True
sperm travels along the ductus deferens before reaching the spermatic cord
False
Sustentacular cells secrete inhibin, which regulates the rate of sperm production
True
Testosterone stimulates development of the secondary sex characteristics, spermatogenesis, and libido
True
Erectile dysfunction prevents ejaculation in most cases
False
at early puberty, follicle stimulating hormone (FSH) and luteinizing hormone (LH) stimulate enlargement of the testes
True
Spermiogenesis is the last stage of meiosis
false
sperm make up just 10% of semen volume
True
Only germ cells undergo meiosis, which produces four haploid cells with 23 chromosomes each
True
Sympathetic nerve fibers trigger the secretion of nitric oxide, which dilates the deep arteries allowing blood to engorge the penis
False
The first haploid stage of spermatogenesis is prophase II
False
myotonia of skeletal muscles is characteristic of the excitement phase and refractory period
False