thirst

Examples of thirst in the following topics:

• Regulation of Water Intake

  • Body water homeostasis is regulated mainly through ingested fluids, which, in turn, depends on thirst.
  • Thirst is the basic instinct or urge that drives an organism to ingest water.
  • Thirst is a sensation created by the hypothalamus, the "Thirst Center" of the human body.
  • Thirst is an important component of blood volume regulation, which is slowly regulated by homeostasis.
  • Angiotensin II acts on the hypothalamus to cause the sensation of thirst.

• Signs and Symptoms of Shock

  • Hypothermia, due to decreased perfusion and evaporation of sweat, and thirst and dry mouth, due to fluid depletion may also be present.

• Drive-Reduction Theory of Motivation

  • Motivations are commonly separated into two types: drives are acts of motivation like thirst or hunger that have primarily biological purposes, while motives are fueled primarily by social and psychological mechanisms.
  • Primary drives are innate biological needs (e.g., thirst, hunger, and desire for sex) that are usually necessary for survival.

• Tissues and Aging

  • A compromised sense of thirst as a consequence of aging led these elderly people to be severely dehydrated.
  • Because water balance is altered and the sensation of thirst diminishes with age, older people are more susceptible to dehydration.

• Hormonal Regulation of the Excretory System

  • This causes increased thirst, but water taken in is lost again and must be continually consumed.
  • Angiotensin II, in addition to being a potent vasoconstrictor, also causes an increase in ADH and increased thirst, both of which help to raise blood pressure.

• Fluids and Aging

  • In adults over the age of 50 years, the body's thirst sensation reduces and continues diminishing with age, putting this population at increased risk of dehydration.

• Classical Theory of Motivation

• Biopsychology

  • Key areas of focus include sensation and perception, motivated behavior (such as hunger, thirst, and sex), control of movement, learning and memory, sleep and biological rhythms, and emotion.

• Functions of the Diencephalon

  • The hypothalamus controls body temperature, hunger, thirst, fatigue, sleep, and circadian cycles.

• Regulation of Water Output

  • Angiotensin II has a variety of effects (such as increasing thirst) but it also causes release of aldosterone from the adrenal cortex.