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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