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Homeostasis and Thermoregulation
N/A
17
Biology
Undergraduate 2
04/06/2014

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Cards

Term
Mechanism components of homeostasis
Definition
  1. Stressor
  2. Sensor/receptor
  3. Integrator
  4. Effector
Term
Stressor
Definition
Causes perturbation away from set point
Term
Sensor/receptor
Definition
Detects error signal produced by deviation from set point
Term
Integrator
Definition
Processor that receives info from sensor and sends signals to effector
Term
Effector
Definition
Produces changes in internal environment
Term
Positive feedback loop
Definition

Deviates from homeostasis, driving reactions to completion

Ex: Child birth

Term
Negative feedback loops
Definition
Brings environment back to homeostasis
Term
Feedforward
Definition

Organism reacts to stimulus by changing downstream responses to stimulus

 

Term
Homeotherm
Definition
An animal whose internal temperature stays relatively constant
Term
Poikilotherm
Definition
An animal whose internal temperature varies along with the environment
Term
Endotherm
Definition

An animal that obtains heat from internal sources (metabolism)

** Note: It may or MAY NOT be able to maintain constant temperature **

Term
Ectotherm
Definition
Animal that obtains heat from external sources
Term
Acclimatization
Definition
Adjustment of behavior and physiology to be better suited to the environment
Term
Examples of acclimation
Definition
  1. Showering off with water
  2. Huddling
  3. Change blood flow to skin via dialation/constriction of blood vessels or heart rate
  4. Fur
  5. Countercurrents
  6. Sweating
  7. Panting
  8. Brown fat
  9. Hibernation
Term
Brown fat
Definition

Used for warming

Large amounts of blood vessels and mitochondria

Mitochondria contain thermogenin, which promotes production of heat but decreases production of ATP

Term
Types of heat exchange
Definition
  1. Radiation
  2. Convection
  3. Conduction
  4. Evaporation
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