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all of the following are true of the nervous system, except that it doesn't
function independently of the endocrine system.
What is the mechanism of action of lipid-soluble hormones?
activation of mRNA, which increases protein synthesis in the cel
After a lipid-soluble hormone is bound to its intracellular receptor, what does the hormone complex do?
acts as a transcription factor and binds to DNA, activating a gene
What keeps intracellular receptors from binding to DNA before a hormone binds to the receptor?
chaperone proteins (chaperonins)
What type of hormones bind to receptors located on the cell membrane?
water-soluble hormones, such as insulin and epinephrine
Which intracellular substance degrades cAMP, thus inactivating the response to a hormone?
Which is the correct order of events for hormones activating Gs proteins?
activation of G protein, binding of GTP, activation of adenylate cyclase, conversion of ATP to cAMP
Which of the following substances activates protein kinases and thus acts as a second messenger?
All of the following are true of steroid hormones, except that they
are produced by the suprarenal medulla
Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arrhythmias. What glands are these and which hormone is lacking?
parathyroid glands; parathyroid hormone
If the adenyl cyclase activity of liver cells were missing, which of these hormones could no longer stimulate release of glucose?
Destruction of the supraoptic nucleus of the hypothalamus would have which result?
loss of ADH secretion
Which of the following hormones may lead to acromegaly if hypersecreted after closure of the epiphyseal plates?
The pituitary hormone that controls the release of glucocorticoids from the suprarenal cortex is
The pituitary hormone that promotes ovarian secretion of progesterone and testicular secretion of testosterone is
After brain surgery, a patient receiving postoperative care in an intensive care unit began to pass large volumes of very dilute urine. The ICU nurse administered a medicine that mimics one of the following hormones. Which one?
The hormone that may be slowly administered by intravenous drip to accelerate labor and delivery is
Which of these signs is often seen in patients suffering from hyperthyroid disease?
elevated heart rate, elevated oxygen utilization, elevated body temperature
Inadequate iodine in the diet may lead to
cretinism, high blood levels of TSH, hypothyroidism, myxedema
Damage to cells of the zona fasciculata of the suprarenal cortex would result in
decreased ability to convert amino acids to glucose
If a diabetic patient received too much insulin, the low blood sugar could be corrected by injecting
During the alarm phase of the general adaptation syndrome (GAS) there is
mobilization of energy reserves.
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