Hormonal actions on cells include those that affect
quantities of enzymes, activities of enzymes, synthesis of enzymes, gating of ion channels
The link between a first messenger and a second messenger in a cell that responds to peptide hormones is usually
a G protein
When adenyl cyclase is activated
ATP is consumed, cAMP is formed
After a steroid hormone binds to its receptor to form an active complex
gene transcription is initiated
The most complex endocrine responses involve the
Hormone release may be controlled by which of the following factors?
blood level of an ion-like potassium, blood level of glucose, blood level of a hormone, nervous stimuli
Changes in blood osmotic pressure would most affect the secretion of
Regulatory factors that control secretion of adenohypophyseal hormones are release by neurons at the __________ of the hypothalamus.
The hypothalamus controls secretion by the adenohypophysis by
secreting releasing and inhibiting factors into a tiny portal system
Neurons of the supraoptic and paraventricular nuclei of the hypothalamus manufacture
ADH and oxytocin
Secretory cells of the adenohypophysis release
FSH, TSH, and GH
The posterior pituitary gland secrets
The hormone produced by the pars intermedia of the adenohypophysis during early childhood is
Each of the following hormones is produced by the pars distalis of the adenohypophysis, except
The hormone oxytocin
Promotes uterine contractions, is responsible for milk expression from mammary glands, triggers prostate gland contraction
Growth hormone does all of the following except that it
causes fat accumulation within adipocytes
Liver cells respond to growth hormone by releasing hormones called
The pituitary hormone that triggers the release of thyroid hormone from the thyroid gland is
The pituitary hormone that controls the release of glucocorticoids from the suprarenal cortex is
The pituitary hormone that promotes egg development in ovaries and sperm development in testes is
The pituitary hormone that promotes ovarian secretion of progesterone and testicular secretion of testosterone is
The pituitary hormone that stimulates milk production by the mammary glands is
The pituitary gland that stimulates cell growth and replication by accelerating protein synthesis is
The pituitary hormone that causes the kidney to reduce water loss is
Which of the following is a known effect of thyroid hormone on peripheral tissues?
increased oxygen consumption, increased heart rate, increased sensitivity to adrenergic stimulation, increased body temperature
Thyroid hormone contains the element
Mental and physical sluggishness and low body temperature may be signs of
The hormone that plays a pivotal role in setting the metabolic rate and thus impacting body temperature is
A hormone that can lower blood levels of calcium ion is
The condition known as goiter can result from too
little iodine in the diet.
The C cells of the thyroid gland produce
Increased levels of the hormone _______ will lead to increased levels of calcium in the blood.
The hormone that does the opposite of calcitonin is
Angiotensin I is converted to angiotensin II by converting enzymes in the
The enzyme renin is responsible for the activation of
The parathyroid glands produce a hormone that
increases the level of calcium ions in the blood
The zona reticularis of the suprarenal cortex produces
The zona fasciculata of the suprarenal cortex produces
The zona glomerulosa of the suprarenal cortex produces
The suprarenal medulla produces
A hormone that produces gluconeogenesis in the liver is
A hormone that helps to regulate the sodium ion content of the body is
The pancreatic hormone that causes blood sugar levels to fall is
Too little secretion of cortisol and aldosterone causes
A hormone that is synergistic to growth hormone is
When blood glucose levels rise,
insulin is released
When blood glucose levels fall,
glucagon is released
Cells of the suprarenal cortex produce
The beta cells of the pancreatic islets produce
The delta cells of the pancreatic islets produce
Each of the following is true of the pineal gland, except that it
is a component of the hypothalamus
The exocrine portion of the pancreas produces
The pancreatic islets (islets of langerhans)
contain four types of endocrine cells
The pancreatic hormone that causes blood sugar to enter its target cells is
Inability of the pancreas to produce insulin results in
The interstitial cells of the testes produce
Follicle cells in the ovary secrete ___________ when stimulated by FSH.
A structure known as the corpus luteum secretes
When hormones interact they can produce any of the following kinds of effects, except
The hormone that opposes the release of of FSH in both males and females is
The hormones that are important for coordinating the immune response are
Which of these hormones increases production of red blood cells?
Proper growth requires which of these hormones?
thyroid hormone, calcitrol, insulin, growth hormone, **all of the above
Increased aggressive and assertive behavior is associated with an increase in which of these hormones?
Excess secretion of growth hormone during early development will cause
The hormone that dominates during the alarm phase of the general adaptation syndrome is
During the alarm phase of the general adaptation syndrome there is
mobilization of energy reserves
If stress lasts longer than a few hours, an individual will enter the __________ phase of the general adaptation syndrome.
Hormones that dominate during the resistance phase of the general adaptation syndrome are the
During the resistance phase of the general adaptation syndrome
lipid reserves are mobilized
The exhaustion phase of the general adaptation syndrome is characterized by
decreased resistance to disease and infection
Cholecalciferol is synthesized within the
epidermis of the integumentary system
coordinate ciliary movement among epithelial cells, coordinate the contractions of cardiac muscle cells, facilitate the propagation of action potentials from one cell to the next at electrical synapses, **all of the above
__________ are chemical messengers that are released in one tissue and transported in the bloodstream to alter the activities of the specific cells in other tissues.
Inadequate iodine in the diet may lead to
hypothyroidism, cretinism, goiter, high blood levels of TSH, **all of the above
Cells can respond to ___________ hormones at the same time.
3 or less
Norepinephrine and epinephrine are considered to be _________ when released into the bloodstream, but _________ when released at synapses.
The kidneys secrete
renin, erythropoietin, calcitrol
The heart is know to secrete all of the following hormones, except
thymosin and thyroxine
Thyroxine and calcitonin are secreted by the
Melatonin is produced by the
A kinase is an enzyme that performs
An activated G protein can trigger
the production of diacyglycerol, the opening of calcium ion channels in the membrane, the release of calcium ions from intracellular stores, a fall in cAMP levels
Calcium ions serve as messengers, often in combination with the intracellular protein
Hormones can operate on the ________ level of organization
cellular, tissue, organ, organismic
The functional organization of the nervous system parallels that of the ________ system in many ways.
The hypothalamus acts as both a neural and a(n) __________ organ.
A simple endocrine reflex involves ________ hormone(s).
The action of thyroid hormone on a target cell involves all of these steps except one. Identify the incorrect step.
binding to a hormone recptor in the plasma membrane
PRL is to ________ as ACTH is to ________.
If a diabetic patient received too much insulin, the low blood sugar could be corrected by injecting
Where does the chemical reaction between thyroglbulin and iodine take place?
in the lumen of the thyroid follicle
Melanocyte-stimulating hormone (MSH) is secreted by the human pars intermedia
during pregnancy, in very young children, during fetal development, in some disease processes
The two lobes of the pituatary gland together produce how many hormones?
The hormone that may be slowly administered by an intravenous drip to accelerate labor and deliver is
TSH plays a key role in the _________ of thyroid hormones.
synthesis and release
The control of calcitonin excretion is an example of direct _________ regulation.
Parathyroid hormone does all of the following, except that it doesn't
build up bone
Alpha cells are to ________ as beta cells are to _________.
Which of the following substances activates kinases and thus acts as a second messenger?
The primary target of insulin is
skeletal, cardiac and smooth muscle; adipocytes; liver cells
In general, the effects of natriuretic peptides _______ those of of angostensin II.
After brain surgery a person receiveing 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.
Cushing disease results from an excess of
The term used to describe excess production of urine is
Which of the following hormones is water soluble and therefor binds to extracellular receptors?
insulin and epinephrine
The primary function of ADH is to
decrese the amount of water lost at the kidneys
Reduction of fluid losses at the kidneys due to the retention of Na+ is the action of
The suprarenal medulla produces the hormones
epinephrine and norepinephrine
The adenyl cyclase activity of liver cells were missing, which of these hormones could no longer stimulate release of glucose?
Increased activity of phosphodiesterase in a target cell would decrease its level of
Destruction of the supraoptic nucleus of the hypothalamus would have which result?
loss of ADH secretion
All target cells
have hormone receptors and respond to chemical signals
In persons with untreated diabetes mellitus,
blood glucose levels are very high, excessive thirst is shown, glucose is present in the urine in large amounts, a large excretion of urine occurs
If the median imminence of the hypothalamus is destroyed, the hypothalamus would no longer be able to control the secretion of which of the following hormones?
TSH, ACTH, and PRL
The hypophyseal portal system
has two capillary plexuses connected by short veins, carries neurosecretions to the anterior lobe of the pituitary, carries ADH and oxytocin
Damage to cells of the zona fasciculata of the suprarenal cortex would result in
decreased ability to convert amino acids to glucose
A rise in cortisol would cause an increase in each of the following except
A rise in angiostensin II levels would result in all of the following except
increased urine production.
Decreased blood flow to the kidneys would lead to which of the following?
increased blood levels of renin, elevated blood levels of angiostensin, increased blood levels of erythropoietin
If a patient is administered a powerful glucocorticoid to suppress the immune system, what is unintended effects might this have on blood chemistry?
increase of insulin, increase of blood glucose
Which of the following might occur in an overdose of insulin?
low blood pressure
Which of these statments about melatonin is false?
exposure to light stimulates production
The condition known as season affective disorder may be caused by
increased levels of melatonin
Shelly has a hormone-secreting tumor of the suprarenal gland. The tumor is causing her to have a deep voice, to grow extensive body hair, and to stop menstruating. This tumor probably involves cells of the
Which of the following hormones may lead to acromegaly if hypersecreted after closure of the epiphyseal plate?
Which of the following hormones increases and prolongs effects of the sympathetic nervous system?
Which of the following organs contains target cells for oxytocin?
prostate, ductus deferens, mammary glands, uterus
Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arythmias. What glands are these and which hormone is lacking?
parathyroid glands and parathyroid hormone
Which of the following is not an action of TSH?
inhibits T3 and T4 secretion
Which of the following cooperate to prepare the mammary glands for milk secretion?