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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

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