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Homeostasis
By: Dhruv Patel
Introduction
1. What is Homeostasis?
2. Why do we need Homeostasis?
3. What processes are Involved?
4. Examples
5. Responses
6. Activity
7. Conclusion
What is it?
Homeo = same
Stasis = standing still
Maintain a stable environment
Why do we need it?
Can you live without it?
Without it there is no life
How Does it Work?
Positive Feedback Loops Away from the normal
Negative Feedback Loops Towards the normal Greenhouse
Processes Involved
Controlled and coordinated by nervous system and endocrine system
Various receptors and effectors
Neurons & neurotransmitters
Processes Involved
1. Imbalance
“Shit hits the fan”
2. Stimulus
Produces change in variable
Processes Involved
3. Receptor
Change is detected
Via: Chemoreceptors Thermoreceptors Mechanoreceptors
Processes Involved
4. Input
Information sent along afferent pathway to Control Center
5. Control Center
The control center determines the appropriate response and course of action
Afferent pathways carry nerve impulses toward from the CNS
Process Involved
6. Output:
Information sent along efferent pathway to effector
Efferent Pathways carry nerve impulses away from the CNS and toward the effectors
Process Involved
7. Response
Response of effector feeds back to influence magnitude of stimulus and return variable to homeostasis
A response from the effector balances out the original stimulus to maintain homeostasis
Back to Normal
Processes Involved
Responses
Behavioral
Physiological
Examples
1. Negative Feedback Body Temperature Glucose Levels Immune Response
2. Positive Feedback Birth Blood Clotting
Activity
1. What is Homeostasis? Choose the most correct answer.
A. A process used to keep the internal and external environments stable
B. Homeostasis is the process used by the body to maintain a stable internal environment.
C. Homeo means same; stasis means standing still
D. Both (b) and (c)
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Activity
2. Identify the processes involved from initial response to end.
A. Imbalance, Receptor, Control Center, Effector, Variable (homeostasis)
B. Imbalance, Stimulus response, Receptor, Control Center, Effector, Variable (homeostasis)
C. Stimulus Response, Imbalance, Receptor, Control Center, Effector, Variable (homeostasis)
D. Receptor, Stimulus Response,, Control Center, Effector, Variable (homeostasis)
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Activity
3. Can an individual survive without homeostasis?A. Of course, all he/she needs is beer (the best cure fo
r all problems)
B. Yes, but the individuals has to be very intelligent
C. No
D. Yes, research shows not animals require homeostasis for survival
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Activity
4. Which one of these examples is describing a negative feedback mechanism?
A. Sweating due to high temperature
B. Blood clotting due to injury
C. Birth
D. Production of oxytocin
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Activity
5. Which one of these examples is describing a Positive feedback mechanism?
A. Sweating due to high temperature
B. Profuse exercise
C. Production of TSH (Thyroid Stimulating Hormone) and thyroxin
D. Child birth
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Activity
6. Which on of the following examples is a behavioral response in terms of Homeostasis?
A. Migration
B. Anger
C. Shivering and sweating
D. Blood Clotting
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Activity
7. Which on of the following examples is a physiological response?
A. Blood clotting
B. Shivering and sweating
C. Child birth
D. Glucose regulation in the body
E. All of the above
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Conclusion
1. Stabilization of the internal environment
2. Our survival depends on it
3. Imbalance, Receptors, Control Center, Effectors, Homeostasis achieved
4. Various Examples
5. Responses
Questions
References
https://www.youtube.com/watch?v=5HS66q_OA8g
http://anatomyandphysiologyi.com/homeostasis-positivenegative-feedback-mechanisms/
http://examples.yourdictionary.com/homeostasis-examples.html
Exercise Physiology for Health, Fitness, and Performance, pg 625
http://quizlet.com/6410293/homeostasis-flash-cards/
http://www.youtube.com/watch?v=_0afKWu4yVg&feature=kp