pftr 1121 assignment 1 homeostasis
DESCRIPTION
AssignmentTRANSCRIPT
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S
Homeostasis
By: Dhruv Patel
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Introduction
1. What is Homeostasis?
2. Why do we need Homeostasis?
3. What processes are Involved?
4. Examples
5. Responses
6. Activity
7. Conclusion
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What is it?
Homeo = same
Stasis = standing still
Maintain a stable environment
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Why do we need it?
Can you live without it?
Without it there is no life
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How Does it Work?
Positive Feedback Loops Away from the normal
Negative Feedback Loops Towards the normal Greenhouse
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Processes Involved
Controlled and coordinated by nervous system and endocrine system
Various receptors and effectors
Neurons & neurotransmitters
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Processes Involved
1. Imbalance
“Shit hits the fan”
2. Stimulus
Produces change in variable
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Processes Involved
3. Receptor
Change is detected
Via: Chemoreceptors Thermoreceptors Mechanoreceptors
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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
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Process Involved
6. Output:
Information sent along efferent pathway to effector
Efferent Pathways carry nerve impulses away from the CNS and toward the effectors
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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
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Back to Normal
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Processes Involved
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Responses
Behavioral
Physiological
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Examples
1. Negative Feedback Body Temperature Glucose Levels Immune Response
2. Positive Feedback Birth Blood Clotting
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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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Sorry!Try Again
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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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Sorry!Try Again
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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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Sorry!Try Again
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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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Sorry!Try Again
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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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Sorry!Try Again
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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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Sorry!Try Again
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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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Sorry!Try Again
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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
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Questions
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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