balancing act- mechanism of homeostasis write everything that is underlined homeostasis
TRANSCRIPT
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Balancing Act-Mechanism of Homeostasis
Write everything that is
underlined
Homeostasis
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Mechanisms of Homeostasis
What is Homeostasis ?Homeostasis is the regulation and maintenance of the internal environment of the body
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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
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Mechanisms of Homeostasis
How does Homeostasis work?
b. Organ systems work together to maintain homeostasis so organism can survive and function normally
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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
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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
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Mechanisms of Homeostasis
II. Feedback Loops
Feedback compares current conditions to set ranges.
Two types:a. Negative feedback loopsb. Positive feedback loops
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Mechanisms of Homeostasis
Negative Feedback
Negative feedback stops the changeExample: Maintaining body temp.
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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