Brain + Behavior Ch 9
In mammals, the saltiness of the _______ environment _______.
extracellular; is similar across species
People suffering from bulimia nervosa
get caught in binge-purge eating cycles.
_______ and ______ have opposing effects on "hunger" neurons.
ghrelin; PYY3-36
A general feature of homeostatic mechanisms is
redundancy.
The receptors that detect drops in extracellular volume are located in the
vascular system.
Suppose that your car battery dies, and you find yourself stranded in a winter storm. Which response would not be considered a behavioral mechanism for regulating body temperature while you are waiting for help to arrive?
Lowering your breathing rate
Which statement about leptin is false?
It is believed to exert short-term control over appetite.
What is the effect of injecting of anandamide into the hypothalamus?
It stimulates eating.
Which hormone monitors the body's longer-term energy reserves in the form of fat?
Leptin
One of the primary causes of eating disorders is believed to be
a cultural that emphasizes thinness as being attractive.
Long-term energy storage is accomplished by storage of fat in _______ tissue.
adipose
Angiotensin II acts on the _______ to provoke the release of _______.
adrenals; aldosterone
The hormone _______ acts to conserve sodium by acting on the _______.
aldosterone; kidneys
The hormone _______ is generated in the kidney via a cascade of enzymatic actions in response to hypovolemia.
angiotensin II
Neuropeptide Y (NPY) neurons and pro-opiomelanocortin (POMC) neurons have opposing effects on _______ and _______.
appetite; metabolism
A drop in extracellular volume is detected by specialized
baroreceptors.
About 10-20% of the energy we ingest is used for _______ processes.
behavioral
The stimuli associated with food, such as its smell, provoke the release of insulin during the _______ phase.
cephalic
The peptide _______, released by the gut after eating, transmits information about nutrient levels to the nucleus of the solitary tract (NST) via the vagus nerve.
cholecystokinin (CCK)
Two physiological responses to hypovolemia are _______ of blood vessels and the secretion of _______ by the posterior pituitary.
constriction; vasopressin
The body fluid compartments change with_______ upon severe water loss.
decreased blood pressure and decreased plasma volume
Sweet urine is symptomatic of
diabetes mellitus.
Injecting PYY3-36 into rats causes them to
eat less.
Animals whose body temperature is regulated mainly by internal bodily processes are called
endotherms.
Amino acids that are not manufactured by our bodies are classified as
essential.
Endotherms may show a significant departure from their average body temperatures as
fever.
The body stores glucose for later use after first converting it to a more complex form called
glycogen.
One of the reasons we know that insulin is not the only cue for satiety is that
high doses of insulin initiate eating.
Research using fMRI shows that drinking glucose after fasting induces activity in the
hypothalamus.
One of the selective advantages of endothermy appears to be
increased capacity to sustain a high level of muscular activity.
A(n) _______ solution is a solution with the same concentration as physiological saline.
isotonic
Physiological saline is also sometimes described as
isotonic.
Under conditions of prolonged food deprivation, fat can be converted into glucose and a secondary form of fuel, called
ketones.
Which structure produces angiotensin II?
kidneys.
Behavioral regulation of body temperature, like moving closer to the fire, is especially affected by lesions of the
lateral hypothalamus.
The response to increase in the salt concentration of the extracellular solution is called _______ thirst.
osmotic
The two main kinds of thirst are _______ thirst and _______ thirst.
osmotic; hypovolemic
People with a BMI of 25-30 are in the body weight Level of
overweight.
Thermoregulation is considered a negative feedback system because
restoring the desired temperature turns off the response.
The brain responds to hypovolemia by triggering both thirst and hunger for
salt.
In rats, lesions of the ventromedial hypothalamus (VMH) lead to all of the following except
self-maintenance of normal weight.
Research on the effects of leptin indicates that activation of POMC neurons in the hypothalamus
suppresses hunger.
When a cell comes into contact with pure water it
swells.
When an animal loses a lot of blood, there is a tendency of baroreceptors to signal
thirst.
The type of diabetes called _______ is characterized by a cessation of insulin production early in life.
type I diabetes
One of the reasons we know that glucose cannot be the only cue for satiety is that
untreated diabetics are hungry.
Anticipation of glucose in the blood facilitates which phase of insulin release?
Cephalic
Which method is not a current strategy for treating obesity?
Drugs that increase digestive acid levels in the stomach
Which pair of hormones have opposing effects on NPY neurons?
Ghrelin and PYY3-36
Which pancreatic hormone promotes the conversion of glycogen to glucose?
Glucagon
Which pancreatic hormone promotes the conversion of glucose to glycogen?
Insulin
Which response is not a physiological response of the mammalian thermoregulatory system?
Lying in the shade
Which statement correctly describes osmotic pressure?
The tendency of a solvent to move across a membrane in order to equalize the concentration of solute on both sides of the membrane
Lesions to which brain region would impair physiological responses to temperature in endotherms?
Preoptic area
What percent of food energy is spent on basal metabolism?
80‒90%
Which event will trigger osmotic thirst?
A salty meal
Which example demonstrates ectothermic behavior?
A turtle basking on a sunny log
In rats with LH lesions, which outcome does not occur?
An initial increase in food intake
Which hormone causes blood vessels to constrict?
Angiotensin II
_______ procedures bypass part of the intestinal tract or stomach in order to reduce the absorptive capacity of the digestive system.
Bariatric
Which items are incorrectly paired?
Bulimia nervosa; significant weight loss
_______ involves periodic binge eating followed by _______ or taking laxatives to avoid weight gain.
Bulimia; vomiting
Which intervention or research findings has not been an effective weight loss strategy?
Drugs that block the visual appeal of food
_______ refers to the active process of maintaining a relatively stable internal environment.
Homeostasis
Leptin inhibits the secretion of _______ neurons, which work(s) in opposition to POMC neurons.
NPY
Which circumventricular organ contains osmosensory neurons?
Organum vasculosum of the lamina terminalis (OVLT)
High circulating levels of leptin activate the _______ satiety neurons and simultaneously inhibit the _______ hunger neurons.
POMC; NPY
Which statement about anorexia nervosa is true?
People with anorexia think about food a great deal.
Which molecule is known as antidiuretic hormone?
Vasopressin
