Homeostasis Flashcards
What are human survival needs?
Nutrients (glucose, protein, fats)
Oxygen
water Body Temp
Atmospheric Pressure
Who invented Homeostasis?
Claude Bernard
What are the components of the homeostasis Regulation system?
Control Center (Brain endocrine)
Effectors (muscles organs or glands)
Receptors (Montor)
What is homeostasis?
Body’s ability to maintain stable environment
- Dynamic
-Responsive
-e.g Temp Regulation
Negative feedback Dfn.
Reverse change in a controlled condition
drastic change
Temperature Range
35.6-37.8 degrees celcius
Receptors
Thermoreceptors
Control centers
(hypothalmus Brain)
Hypothalamic regulatory center
Effectors
(muscles and glands)
controlled by antagonist action
Push Pull Effect
Negative Feedback: Function
prevents sudden change in the body
maintains things in normal limits
Negative Feedback: Directed
by receptors
indicate weather levels are too high or too low
Negative feedback: Activates
Effectors
induce opposite effect
Positive Feedback: Function
Controls infrequent events that do not require continuous adjacent
Positive Feedback: Response
Effectors intensifies/Reinforces
controlled by condition change
Positive Feedback: Change
Continues until interupted
homeostasis restored
Positive Feedback: Exapmles
blood clotting
ovulation (oestrogen)
labour contractions (oxytocin)
What is Autonomic Nervous System? (ANS)
“self controling”
Network of nerves that communicates with in the body
Controls involuntary physiological functions and maintains homeostasis
E.g. normal heart rate
blood pressure
digestion
breathing
What is the ANS function to homestasis?
Maintain Homeostasis and stable enviorment
Sympathetic System
Moblises Fight or flight
- accelerates body processes
- activated when threatened or challenged
-increased functions
- 3 es excersise, excitement and emergency
Parasypathetic
Relaxes - rest and digest
Vagus nerve (2nd largest)
looks after recuperation
controls heart rate under normal conditions
Humans = homeothermic
require stable core temperature
Homeostasis and temp regulation
S1. exceeds upper limit
signals sent to peripherary
vasodilation of BV
excess heat to exterior
S2. Drops below set limit signals (via effectors)
sent to periphery to conserve heat
shivery, vasoconstriction and assumption of huddle position.
