Chapter Twelve Flashcards
Instinct
A complex behavior that is rigidly patterned throughout a species and is unlearned
Motivation
A need or desire that energizes and directs behavior
Drive-Reduction Theory
The idea that a physiological need creates an aroused tension state (a drive) that motivates an organism to satisfy the need
Homeostasis
A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level
Incentive
A positive or negative environmental stimulus that motivates behavior
Abraham Maslow’s Hierarchy of Needs
Pyramid of human needs, beginning at the base with physiological needs that must first be satisfied before higher-level safety needs, love needs, esteem needs, and finally self actualization needs become active
Arousal Theory
Motivated by the need to eliminate boredom
Glucose
The form of sugar that circulates in the blood and provides the major source of energy for body tissues. When its level is low, we feel hunger.
The lateral hypothalamus ________ hunger while the ventromedial hypothalamus _________ hunger.
Brings on ; Depresses
Orexin
A hormone secreted by the hypothalamus that triggers hunger
Ghrelin
The hormone secreted by an empty stomach that arouses hunger.
- Gastric bypass surgery seals off part of the stomach, which reduces hunger/appetites
Leptin
Protein secreted by the fat cells to suppress hunger. When abundant, the brain increases metabolism and decreases hunger.
PPY
Hormone from the digestive tract that suppresses appetite
Set Point
The point at which an individual’s “weight thermostat” is supposedly set. When the body falls below this weight, an increase in hunger and a lowered metabolic rate may act to restore the lost weight.
Basal Metabolic Rate
The body’s resting rate of energy expenditure
Settling Point
As opposed to a set point, the level at which a person’s weight settles in response to caloric intake and expenditure
