Balancing Act- Mechanism of Homeostasis Write everything that is underlined Homeostasis.
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Transcript of Balancing Act- Mechanism of Homeostasis Write everything that is underlined Homeostasis.
Balancing Act-Mechanism of Homeostasis
Write everything that is
underlined
Homeostasis
Mechanisms of Homeostasis
What is Homeostasis ?Homeostasis is the regulation and maintenance of the internal environment of the body
Mechanisms of Homeostasis
I. Why Homeostasis?Conditions within the body must remain within a narrow range – like your body temperature
a. Homeostasis involves keeping the internal environment within set ranges
Mechanisms of Homeostasis
How does Homeostasis work?
b. Organ systems work together to maintain homeostasis so organism can survive and function normally
Mechanisms of Homeostasis
c. Control systems help maintain homeostasis. Receptor : Organs that gather data
control center : receives data/ messages
communicate messages to effector organs
Effector : Organs that respond to change
pore
sweat glands
hairfolliclemuscle
goosebump
Mechanisms of Homeostasis
Example:
O2 / CO2 level returns to normalEffector
ResponsesControl system forces exhale, inhale
Control system gets information
Holding breath, CO2 levels rise
ReceptorSenses change
NervousRespiratoryMuscular
Mechanisms of Homeostasis
II. Feedback Loops
Feedback compares current conditions to set ranges.
Two types:a. Negative feedback loopsb. Positive feedback loops
Mechanisms of Homeostasis
Negative Feedback
Negative feedback stops the changeExample: Maintaining body temp.
Mechanisms of Homeostasis
c. Positive feedback increases change –Example: Torn blood vessel
stimulates release of clotting factors
–growth hormones stimulate cell division
platelets
fibrin
white blood cellred blood cell
blood vessel
clot